When twelve-year-old John Wilson walked into his chemistry class on a rainy day in 1931, he had no way of knowing that his life was to change completely.

1931年的一个雨天，12岁的约翰·威尔逊走进他的化学教室，那会儿他完全不知道自己的生活将彻底改变。

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The need for praise is such an ingrained part of my personality that I doubt I’d be able to change completely, but I can do better.

对表扬的需要是我个性中根深蒂固的一部分。 我怀疑我能否彻底改掉这毛病，不过我想我能做得更好。

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To encourage reconciliation, Rwanda has embarked on an experiment to change completely the way a new generation thinks about itself.

为了鼓励和解，卢旺达开始了一场试验，想要完全改变新一代看待自己的方式。

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If you were to make that change you would find that the molecule now has completely different biological and chemical properties.

如果要做出这样的变化,你会发现,分子的生物形状,和化学性质完全改变了。

麻省理工公开课 - 化学原理课程节选

This completely could change if you were to flip from one to the other conformation which can happen in chemical reactions.

在化学反应中,它们的形状,可以从一种折叠成另外一种。

麻省理工公开课 - 化学原理课程节选

Ferrari's Fernando Alonso, who was sixth fastest, expects conditions to change completely, while he also doubts the Italian team will be able to compete at the front of the grid in Melbourne.

CNN: Vettel off to a flier as Red Bull set the pace in Melbourne

But interestingly, the 200 amendments dealt with by MSPs in marathon sessions of parliament on Wednesday and Thursday included a number which will reassure landlords that the world is not about to change completely.

BBC: Croft - generic

At the moment, I train twice a day six days a week but my switch from 400m to 800m meant my training had to completely change.

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