意思不相同。in class這個詞組的意思是“在課堂上；上課中”，側(cè)重強調(diào)的是上課。in the class這個詞組的意思是“在班級里”，不強調(diào)上課或在課堂上。class意思是班；班級；課；上課；(某科目的)系列課程。

We are required to speak English in class.

上課時要求我們說英語。

Tom was admonished for chewing gum in class.

湯姆在課堂上嚼口香糖，受到了告誡。

My Chinese teacher loves to tell jokes in class.

我的語文老師喜歡在課堂上講笑話。

There is an equal number of boys and girls in the class.

這個班男女生人數(shù)相等。

Tom is probably the brightest student in the class.

湯姆大概是班里最聰慧的學生。

Everyone in the class seemed eager to learn.

班上每個人似乎都熱愛學習。

來源：高三網(wǎng)