至少有一些骑手已经知道并且使用这本书里说的一切了。
Everything in this book is already known and used by at least some cyclist.
我们已经了解了很多关于新喀里多尼亚乌鸦使用工具的能力,并且正在对它们进行一些非常有趣的研究。
We've learnt a great deal about the ability of New Caledonian crows to use tools, and some very interesting research is being carried out into them.
西欧人也已经发明并且使用了磁罗盘,当云彩同时遮住了太阳和星星时,它就能起作用。
Western Europeans had also developed and put into use the magnetic compass, which helped when clouds obliterated both the Sun and the stars.
and undoubtedly you have heard and used "who" questions many times before.
毫无疑问,你肯定已经听过并且使用过“who”问句很多回了。
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