fill in 与fill out 意思是否一样的?
它们有什么区别?

fill in
填平, 填满
The workmen dug a hole, mended the pipe, and then filled the hole in again.
工人们挖了个洞, 修补好管道, 然后又把洞填平。
填(写)
Many people find it difficult to fill in a form.
许多人发现表格填写困难。
度过(时光)
The plane takes off in the evening.How can I fill in the time between?
飞机要等到晚上才起飞。我怎么打发这段时间呢?
使(某人)熟悉, 向(某人)提供消息等
Please fill me in on your future plan.
请详细谈谈你今后的打算。
代替; 暂时补缺
He was called on to fill in in an emergency.
他是在紧急情况下被召去临时补缺的。
淤塞
The harbor gradually filled in.
港口渐渐淤塞了。
填补
He fills in a sketch with shadow.
他在画稿上添衬上阴影。

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fill out
〈主美〉填写(表格等)
Please fill out the attached blank.
请把附表填好。
(通常指因充气)鼓起〔膨胀〕
The sails filled out and the boat floated away.
帆张满后船漂走了。
长胖
He'd filled out a lot since I'd last seen him.
自从我上次见到他以来, 他又长胖了好多。
充实; 增补
The manuscript might be usable if the author could fill it out a little.
如果作者稍加充实, 原稿就有用。