Ask the client to flex his knees， if possible， bringing his feet as close to his buttocks as possible.
可能时要求病人屈膝，将脚尽量靠近臀部。

Flex creates mxinternaluid properties for any objects that are dynamic and do not have bindable properties.
照说我的机器配置也很好了, 可是启动的速度就是那么慢。

Can’t understand the guys at the gym who just stand in front of the mirror and flex instead of actually working out.
我不理解那些在体育馆只是站在镜子前而不真正锻炼的人们。

Your PC muscle is the muscle you flex when you urinate. When you flex it purposely you are performing Kegel exercises.
小便时候收缩的肌肉便是你的会阴肌

This style agitator features a robust manufactured carbon steel bearing housing assembly which is intricate to the flex protected drive.
这类混合器的特点是具有坚固的碳钢轴承座用于保护传动。

After a slow saunter onstage, gazing at her highheeled shoes, she would suddenly straighten her back, flex her muscles, throw back her head and let loose an incandescent smile.
她在舞台上缓步片刻, 给自己的高跟鞋一个注目礼。