1.crack 使...破裂

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R]%~4af0c5zULA3mYX。

2.infection 感染

Cholera is a bacterial infection.
霍乱是一种细菌感染8*V[KLI=0G+_e^X=)*a。

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1eyVZ(X3MA)ToLK(d0%m。

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Yf%K_Zz~[y!5&C%Vf。