必要时的英文：
at a push
If it comes to the pinch
in necessity
on occasion

参考例句：
  • If appropriate, the environmental conditions shall be controlled and/or monitored.
    必要时,环境条件应予以控制或监控。
  • If necessary, nylon, acrylic and polyester fibers may be bleached with sodium chlorite under acidic conditions.
    在必要时,尼龙、丙烯腈、涤纶纤维可在酸性条件下用氯化钠漂白。
  • They were ready to die, if necessary, for their country.
    必要时，他们愿为国捐躯。
  • We can put up ten people for the night at a pinch.
    必要时我们可以留宿十个人。
  • She can needle herself if need be.
    必要时她会给她自己打针的。
  • Fit transverse strut if necessary.
    必要时可安装横向支柱。
  • Repeat every few days as necessary.
    必要时每隔几天重复一次。
  • Dr. Zomboss will not show himself until it is necessary.
    僵尸博士会在必要时出现。
  • To review and update as necessary and re-approve documents
    必要时对文件进行评审与更新，并再次批准
  • Where necessary, the people's court may entrust a people's court in another place with the investigation.
    人民法院在必要时可以委托外地人民法院调查。
push是什么意思：
v. 推；催促；逼迫；推进；推行；扩展，扩大；增加
n. 推，推动；奋进，努力
  • That is pushing it.
    那是在推动它。
  • Push is informal and is used for the selling of illegal drugs push
    是口语用词,指出售违禁毒品
  • The sprouts have pushed up the earth.
    嫩芽把土顶起来了。
comes是什么意思：
n. 伴星；伴引血管
v. come的第三人称单数
  • The bale will be coming.
    不幸就要降临了。
  • Come on get with it!
    好啦，时髦点儿吧！
  • Illness comes in by mouth and comes out by it
    病从口入祸从口出
pinch是什么意思：
n. 捏，掐；能捏住或掐住的量
v. 捏，掐；夹痛；擅自拿走；逮捕
  • The pinched look of a hungry person.
    面如菜色。
  • to pinch; to nip; to cut with fingernails
    掐
  • I will help you in a pinch.
    有紧急情况我会帮助你。

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