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.
II. 用于文章承转句

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.

24. (A) 基于这个理由¸… For this reason, …
(B) 为了这个目的¸… For this purpose, …
例︰基于这个理由¸我已决定把行医作为未来的职业。
For this reason, I have decided to take practicing medicine as my future career.

25. 我们有理由相信…
We have reasons to believe (that)子句
例︰我们有理由相信体罚应该严格禁止。
We have reasons to believe that corporal punishment should be strictly prohibited.

26. 事实上¸…
As a matter of fact, …
= In fact, …
例︰事实上¸健康才是最重要。
As a matter of fact, it is health that counts.

27. (A) 例如¸… For example, …
(B) 拿…做例子 Take … for example.
例︰例如¸我们盲目地提高生活水准¸却降低生活品质。
For example, we elevate the living standards blindly, but lower the quality of life.

28. 此外¸我们不应忽视…
Besides (In addition), we should not neglect …
例︰此外¸我们不应忽视每个人都想要一个温馨祥和的社会。
In addition, we should not neglect that everyone wants a friendly and peaceful society.

29. 相反地¸…
on the contrary, …
= by contrast, …
例︰相反地¸少数学生似乎还在鬼混。
On the contrary, a few students, it seems, are still fooling around.

30. 另一方面¸…
on the other hand, …
例︰政府应严格执法¸另一方面¸大众也应该培养减少污染的好习惯。
The government should enforce laws strictly. On the other hand, the public also should develop the good habit of reducing pollution.