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Thursday
Internal External

内部 外部
Several Couple

一些 一对

There has been an internal investigation 调查into why

the problems occurred 发生. Have you measured the

internal diameter直径 of the tube?

There have been external effects which have caused

the costs to rise. The external appearance looks good,

but underneath there are many problems.

There are several reasons why the company is failing,

one of them being them too much spending. Several

people have now joined the group and are working
very hard.

The elderly couple do exercises every day and they are

very fit for their age. You need to couple the two
devices together to make them work properly 正确.

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