飞鸟是很讲究技巧的运动，必须小心以免伤及肩部。
Flyes are a tricky movement and you must do them carefully to minimize the risk of shoulder injury.
大热天外出时应该涂上防晒霜，以免皮肤被晒伤。
You should always put sunscreen on your skin to avoid getting sunburnt when you go out in the hot sun.
对于直接夹持己精加工的表面时，必须采取加软垫等保护措施，以免夹伤己加工面。
For the surface finishing has direct clamping, must adopt padded protection measures, so as to avoid injury has been machined surface.
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