必要时的英语翻译 必要时用英语怎么说

必要时的英语翻译 必要时用英语怎么说

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.

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