Sprain and strain is caused by overstretching.
扭伤和拉伤都是由过度伸展导致。
In tennis often appear some pain, such as: muscle strain, cramps, blisters, sprain, tenosynovitis, tennis elbow, rheumatoid arthritis, etc.
在网球运动中常常会出现一些伤痛，诸如：肌肉拉伤、抽筋、起水泡、扭伤、腱鞘炎、网球肘、风湿性关节炎等等。
In tennis often appear some pain, such as: muscle strain, cramps, blisters, sprain, tenosynovitis, tennis elbow, rheumatoid arthritis, etc.
在网球运动中常常会出现一些伤痛，诸如：肌肉拉伤、抽筋、起水泡、扭伤、腱鞘炎、网球肘、风湿性关节炎等等。
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