Wind surfing can be strenuous but immensely exciting.
风帆冲浪可能紧张吃力,但却非常刺激。
Exercise doesn't need to be strenuous in order to be beneficial.
为了有益锻炼不需要费力。
I told him after dinner can not be strenuous exercise, such as running, jumping and so is not good for the stomach.
我告诉他吃完饭后不能剧烈运动,像跑步、蹦跳等对肠胃非常不好。
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