The study demonstrates harm is caused much faster than early thought.
这项研究表明造成危害的速度远比人们早期认为的要快很多。
But another study found that regular exercise does not harm joints.
但另一项研究发现，有规律的运动不会对关节造成损伤。
But not having breakfast will do harm to their health and their study.
但是不吃早餐会危害他们的健康和学习。
Objective To study the harm of childhood accident to heart.
目的研究儿童意外损伤对心脏的危害。
Objective To study the harm of childhood accident to heart.
目的研究儿童意外损伤对心脏的危害。
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