He cracked his head on the pavement and was knocked cold.
他一头撞到人行道上，不省人事了。
2.infection 感染
Cholera is a bacterial infection.
霍乱是一种细菌感染。
3.cancel 取消
Many trains have been cancelled and a limited service is operating on other lines
多趟列车被取消，其他线路上运行的班次也很有限。
4.negative 消极的
The weakest students can end up with a negative score.
最差的学生可能会以负分收场
