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精练英语怎么说

他对讲话做了精练的概括。
He summarized the speech snappily.

从另一个角度来说，恐惧可以是一种精练你的元素。
From another point, FEAR can be a CHASTENING (purifying) element.

学习数学，不主张“题海”战术，而是提倡精练，即反复做一些典型的题，做到一题多解，一题多变。
Study maths, do not advocate "inscribes sea" tactics, advocate however chastening, namely thresh the problem of a few models, accomplish one problem to be solved more, one problem is changeful.