点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
1. 脑震荡If you suffer concussion after a blow to your head, you lose consciousness or feel sick or confused.
1. any violent blow
2. injury to the brain caused by a blowusually resulting in loss of consciousness
多通过句子记忆单词，而不是单独死记硬背。
