strain的过去式是什么

1. 种，品种
2. 拉紧
3. 张力
4. 过劳
5. 笔调
6. 族，系
7. 扭伤
8. 倾向
9. 气质
10. 语气
11. 紧张，紧张状态
12. 操心
13. 失常
14. 血缘，世系
15. 情调
16. 旋律

1. （被）过滤
2. 滥用，过度使用
3. 拖紧，（被）拉紧，用力拉
4. 伸张
5. 竭力喊
6. 使过劳
7. 紧抱，紧拉，紧拖
8. 变形
9. 渗出
10. 紧靠
11. 尽力，拼命努力，使劲，竭力，尽全力
12. 抽紧，扯紧
13. （使）紧张，绷紧
14. 尽量使用，尽量利用
15. 拉，拖
16. 扭歪，弯曲，歪曲，曲解
17. 快要折断
18. 不肯接受，以为不可
19. 尽力睁大（眼）
20. 超越…之所及
21. 损伤，拉伤，扭伤
22. 使不堪承受
23. 勉强
24. 用力推
25. 受困

1. (physics) deformation of a physical body under the action of applied forces
2. difficulty that causes worry or emotional tension;

   "she endured the stresses and strains of life"
   "he presided over the economy during the period of the greatest stress and danger"
   

3. a succession of notes forming a distinctive sequence;

   "she was humming an air from Beethoven"
   

4. (psychology) nervousness resulting from mental stress;

   "his responsibilities were a constant strain"
   "the mental strain of staying alert hour after hour was too much for him"
   

5. a special variety of domesticated animals within a species;

   "he experimented on a particular breed of white rats"
   "he created a new strain of sheep"
   

6. (biology) a group of organisms within a species that differ in trivial ways from similar groups;

   "a new strain of microorganisms"
   

7. injury to a muscle (often caused by overuse); results in swelling and pain
8. the general meaning or substance of an utterance;

   "although I disagreed with him I could follow the tenor of his argument"
   

9. an effortful attempt to attain a goal
10. an intense or violent exertion
11. the act of singing;

    "with a shout and a song they marched up to the gates"
    

1. to exert much effort or energy;

   "straining our ears to hear"
   

2. test the limits of;

   "You are trying my patience!"
   

3. use to the utmost; exert vigorously or to full capacity;

   "He really extended himself when he climbed Kilimanjaro"
   "Don't strain your mind too much"
   

4. separate by passing through a sieve or other straining device to separate out coarser elements;

   "sift the flour"
   

5. cause to be tense and uneasy or nervous or anxious;

   "he got a phone call from his lawyer that tensed him up"
   

6. become stretched or tense or taut;

   "the bodybuilder's neck muscles tensed;"
   "the rope strained when the weight was attached"
   

7. remove by passing through a filter;

   "filter out the impurities"
   

8. rub through a strainer or process in an electric blender;

   "puree the vegetables for the baby"
   

9. alter the shape of (something) by stress;

   "His body was deformed by leprosy"
   

1. 菌株：活体[[结核]]疫苗是以不具[[传染]]性的结核[[菌株]](strain)所制,但[[卡介苗]]在美国却鲜少使用. ;活体减毒疫苗:利用培养技术制造出的活体微生物,在制程中利用添加化学药剂、改变遗传物质、或是施以物理变化,以得到减低或去除毒性的品种.

2. 拉紧：共同带来为协商(confer),共同坚定为 确认(confirm),共同发现易搞混(confound),共同做过为宽恕(condone),共同夹死为拥挤 (congest),共同给予为默许(connive) 大街上下雨为拉紧(strain),共同拉紧是束缚(constrain),

3. 品系：种以下又分亚种(变种),型,类群,菌株(品系) 菌株(品系)(strain): 表示任何由一个分离的单细胞繁殖成的纯种群体及其一切后代. (二)命名 命名按照<>,采用林奈氏双名法.

1. The sporters strained and struggled.
   运动员奋力扭动摔打。
2. The liquid strained readily.
   这种液体容易过滤。
3. He strained to turn the wheel, but he couldn't.
   他使劲转动车轮子,但没有成功。

1. They strained the wire between two posts.
   他们拉紧了两根电线杆之间的电线。
2. She strained her child to her breast.
   她把孩子紧搂在怀中。
3. She strained her ears to hear what was happening.
   她倾听着所发生的事。
4. She strained her ears, but no sound reached them.
   她竖起耳朵听,但什么也没听见。
5. Don't strain your eyes by reading such small print.
   书上的字体太小,别把眼睛看坏了。
6. He strained his voice.
   他竭力呼喊。
7. I boiled the potatoes and then strained them.
   我把土豆煮熟后把水滤掉。
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8. He realized that she was too strained.
   他意识到她太紧张了。

1. The mistake has caused strained relations between the manager and his staff.
   这个错误造成了经理同雇员之间的紧张关系。
2. He had a strained smile on his face.
   他脸上带着一丝勉强的微笑。

• The starry strain of spirit, thence we are.

  出自：P. J. Bailey

• Hoovering brings on the strain in her back.

  出自：W. Trevor

• The bonds which strained them to the conquerors.

  出自：C. Merivale

• ☆ 1400年左右进入英语，直接源自古法语的estreindre，意为拉紧，挤压；最初源自古典拉丁语的stringere，意为拉紧，绑紧。