The purpose of a trap is to catch and hold animals.
陷阱是用来捕捉野兽的。
Similar results probably hold true for many other animals.
类似的结果可能也适用于许多其他动物。
For example, one-celled animals always live in water, which helps the cell hold its shape.
比如，单细胞动物总是生活在水中，因为水有助于保持它的形态。
For example, one-celled animals always live in water, which helps the cell hold its shape.
比如，单细胞动物总是生活在水中，因为水有助于保持它的形态。
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