艺术家们高度熟练地使用，甚至增强了洞穴墙壁的自然形状，使他们的绘画具有深度和透视感，以及这些动物的动感和活力。

The artists were highly skilled at using, or even enhancing, the natural shape of the cave walls to give depth and perspectives to their drawings, the sense of motion and vitality in these animals.

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熟练地使用纸和剪刀。

Manipulate the paper and scissors.

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你的孩子能够熟练地使用电脑并且意识到网络中可能对你的电脑造成破坏的危险吗？

Is your child proficient at the use of the computer and aware of the dangers that are online that can do your computer harm?

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Physicians over the years of having this instrument have learned how to be very sophisticated about looking at these pictures and diagnosing when something is wrong inside the chest, for example.

这些年来,使用这类设备的医生,已经熟练地掌握了,通过看这些X光片,来诊断,胸部疾病的方法

耶鲁公开课 - 生物医学工程探索课程节选