许多大学都实行上课点名制用英语怎么说。

Many universities have a roll call system .

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主要介绍了现代同步发电机的四凸极整体转子绕组结构，设计了该绕组绕制用的转子铁心固定夹具和绕线模。

The unitary 4-salient pole rotor winding structure of modern synchronous alternator was mainly introduced, and the rotor iron core clamp mould and coiling mould for coiling rotor winding was designed.

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At the beginning of the nineteenth century, in 1800, paper was handmade out of cloth-- that's the way they made it.

在19世纪初叶，即1800年，当时的人用布料手工制纸。

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They invented the paper machine so they could mass-produce paper-- it didn't have to be handmade anymore-- and they invented wood pulp paper so it didn't have to be made out of cloth anymore.

于是人们发明了造纸机从而可以大量生产纸-,而不再需要手工制作-,后来人们还发明了木浆纸,所以后来不再用布料来制纸。

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