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汉语拼音：bì xū

一定要有；不可少：日用～品。煤铁等是发展工业所～的原料。

1. 一定要有，不可缺少。

   《儿女英雄传》第二八回：“一共九件东西，这是作媳妇的事，奉翁姑必需之物。” 沈从文 《从文自传·我的家庭》：“硕大、结实、豪放、爽直，一个将军所必需的种种本色，爸爸无不兼备。”

• We'd also have to see how easy-to-use and well-designed the app is versus the paper form.

  我们还必需了解和纸质表格相比应用程序是否容易使用并且设计合理。

• If FOAF is to support an online community, it is essential that the provenance of every piece of information be traceable.

  如果FOAF要支持在线社区，那么每一段信息的起源必需是可跟踪的。

• High intensity cardio workouts every day, weight lifting at least twice a week and a strict nutritional eating schedule would be necessary.

  每天进行高强度的心肺体育锻炼，体重在第一周内至少上升到两倍，以及严格的营养饮食表是必需的过程。

• I decided I had to ask for her resignation.

  我决定，必需要叫埃尔德斯博士辞职。

• God, when he gave the world in common to all mankind, commanded man also to labour, and the penury of his condition required it of him.

  上帝，当他将这个世界赐给人类共有的时候，也令其必需劳动，而人的贫乏境况也会这样要求。

• At least in the West, the material requisites for a good life would be available to all.

  至少在西方，高质量生活所必需的物质品谁都可以买到。

• This gave him solitude, an excuse for buying the huge amount of fertiliser he needed for the bomb, and a barn big enough to store it.

  这给了他一个与世隔绝的环境，和一个购买制作炸弹所必需的巨量化肥的借口，以及一个大到足够存放它的谷仓。

• In a way, his leaving is almost as necessary as his going out from his mother's earlier help.

  某种程度上，他的离开就如挣脱母亲的怀抱一样，是必需的。

• Usage: Ready-to-use liquid for cold process thickening and emulsifying. No heat or neutralisation required.

  用法：准备好使用的液体冷增厚过程和乳化。无热或中和必需的。