... dose protraction 剂量迁延 Front Protraction 前伸 protraction exposure 低量长时间照射 ...
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评估柔韧性：屈体前伸测试。
落地时双脚并拢，双臂前伸以保持平衡。
Keep your feet together and your arm forward to keep your balance.
许多人跑步时犯得一个错误就是腿部过于前伸，并且用脚跟先着地，这种着地方式让跑步变得低效并且会引起一系列的伤害。
Many runners make the mistake of reaching out in front of their body and landing heel first. That type of foot plant is inefficient and can be the cause of a long list of injuries.
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