短语讲解：

1. A concussion can lead to a feeling of dizziness, headaches and an inability to sleep.

lead to 导致; 把…带到
例句：He speculated that this might lead to a success.
他推测这可能会导致成功。

2. Concussion is a common injury in contact sports.

in contact 联系; 接触
例句：This shows where the foot and shoe are in contact.
这显示了脚和鞋接触的地方。

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