泛指和特指的區(qū)別。in summer就是一般的在夏天里，沒有特別說明是今年的夏天還是過去的夏天，是泛指，例如：We like swimming in summer.而in the summer是特指某一個夏天，例如：in the summer of 1996。

summer相關(guān)例句

I haven't seen him since the summer before last.

我已有兩個夏天沒見過他了。

Each summer a new batch of students tries to find work.

每年夏天都有一批新的學(xué)生要找工作。

I made painting the house my project for the summer.

把房子粉刷了一遍，這就是我的夏季工程。

in summer例句

Even in summer this place did not look exactly hospitable.

即使在夏天，這個地方看起來也不太舒適宜人。

Food is apt to deteriorate in summer.

食物在夏天愛變質(zhì)。

What time does it get dark in summer?

夏天什么時候天黑？

in the summer例句

Why don't you come over to England in the summer?

你為何不在夏天來英格蘭呢？

Anna sat her finals in the summer.

安娜在夏天參加了課程終結(jié)考試。

They plan to get married in the summer.

他們打算夏天結(jié)婚。