老师在课堂上清晰地定义了这些科学概念。

The teacher did a great job ___defining these scientific concepts in class.

这件紧身衣很好地勾勒出她的身材轮廓。

The tight-fitting dress does a great job of ___defining her figure.

这次实验是定义我们研究范围的关键步骤。

This experiment was the ___defining step in establishing the scope of our research.