Even though they understand how you get a cramp in your calf at night, the cause of night cramps is still unknown.
虽然人们知道了造成夜晚小腿休息抽筋的方法，但始终不知道造成抽筋的原因。
Even though they understand how you get a cramp in your calf at night the cause of night cramps is still unknown.
虽然人们知道了造成夜晚小腿休息抽筋的方法，但始终不知道造成抽筋的原因。
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