The sure-fire test for runner's knee: sit down and put your leg out on a chair so that it's stretched out straight.
确诊的方法：坐下来，将一条腿伸直放在椅子上。
I knocked my knee against the chair.
我把膝盖撞到椅子上了。
He sat down in a rocking-chair to think the better, drawing up one leg on his knee and frowning mightily. His mind ran on at a great rate.
他在一个摇椅里坐了下来，以便更好地想想。他把一个脚架在膝盖上，眉头皱紧了，思绪在飞快地变幻。
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