Because I saw some indentations in the paper .

因为我在纸上看到一些凹痕。

Using a nano-sized needle , they poked the cement samples , and measured the indentations using an atomic force microscope .

他们使用纳米尺寸的探针，刺探水泥样品，然后用原子力显微镜观察测量缺口。

Individual indentations of small foreign particles are inevitable .

小杂质的单个凹痕是难免的。

Protected with battlements or parapets with indentations or embrasures for shooting through .

用锯齿状的和有可以射击的枪眼的城垛、胸墙保护。

Having no irregularities , roughness , or indentations ; smooth .

平顺的没有破裂、凹痕，高低不平或其它参差状态的；平滑的。