短语讲解：

1. Here is another example: Let’s say you are talking with a friend you have not seen for a long time.

for a long time 长久日长岁久
例句：He has been waiting for his brother for a long time.
他等候他兄弟已很久了。

2. The two of you could have a lot of catching up to do.

catch up to 赶上; 逮捕
例句：Jane run hard and tried to catch up to her friend.
珍拼命奔跑,试图赶上她的朋友们。

3. Under the sun is an old expression – at least 3,000 years old.

at least 至少
例句：In fact it requires at least n generators.
事实上，它至少要有n个元素。

4. That leads to another expression: a sunshine law.

lead to 导致
例句：That may lead to a serious split in our class.
那可能导致我们班的严重分裂。

5. In addition, labor costs are lower in the Sunbelt, and labor unions are not as strong as in the north.

in addition 另外; 并且
例句：I committed an error in addition.
此外,我还犯了一个错误。

6. Here is part of it.

be part of 属于; 成为…的一部分
例句：The highland game is part of Scotland 's cultural heritage.
苏格兰高地游戏是苏格兰文化遗产的一部分。

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