adj. incubative ; incubatory ; clocking
我们现在认为恐龙化石被发现时的姿势表明孵蛋的行为，也就是说，坐在蛋上直到蛋孵化。
Dinosaur fossils have been found in postures that we now believe to indicate brooding behavior, that is, sitting on the eggs until they hatch.
趁正在孵蛋的母鸡不注意，把蛋换成石头。
Replace the eggs to stones when the incubating hen is distracted.
这化石显示，早在鸟类出现之前，孵蛋的行为就已经演化出来。
The fossil demonstrates that brooding behavior evolved long before there were birds.
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