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21. 俗语说得好：「…」。

Well goes an old saying, "…"

= As an old saying goes(runs, says), "…"

= An old saying goes, "…"

= It's an old saying (that)子句

例︰俗话说得好：「诚实为上策」。

As an old saying goes, "Honesty is the best policy."

22. (A) …用下列方法… … in the following ways.

(B) …有三个主要理由。 … for three major reasons.

(C) 要…¸至少我们可做三件事。 To …, there are at least three things we can do.

例︰(A) 我用下列方法增加信心。

I increase my confidence in the following ways.

(B) 人们学外语有三个理由。

People learn a foreign language for three major reasons.

(C) 为了维护健康¸我们每天至少可做三件事。

To keep healthy, there are at least three things we can do every day.

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23. 那就是(说)…；亦即…

That is to say, …

= That is, …

= Namely, …

例︰我们生活需有规律。也就是说¸早睡早起¸戒除烟酒。

We need to live a regular life. That is, we can keep good hours and refrain from smoking and drinking in the daily activities.