When a tree becomes hollow or part of it becomes dead, it provides a home for small animals and is a source of food for many other animals.
当树中空或部分死亡时，它为小动物提供了一个家，也成为了许多其他动物的食物来源。
It works by shining a hollow laser beam around small glass particles, as Inside Science explains.
它使用中空的激光波束移动微小的玻璃粒子。
Test and study on compression strength and shear strength of the brickwork for a new concrete small hollow block with connector have been carried out.
对一种带联接件的新型混凝土小型空心砌块砌体的抗压强度和抗剪强度进行了试验研究。
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