indent|indented|indenting

在写论文时，记得每段的首行要缩进。

When writing an essay, remember to ___indent the first line of each paragraph.

这片树叶的边缘呈锯齿状，带有小凹口。

The leaf has an ___indented edge with small notches.

孩子们玩耍时不小心把足球踢到车门上，留下了一个小凹痕。

The kids accidentally kicked the soccer ball into the car door, ___indenting it slightly.