likelihood
n.可能，可能性
Using a seatbelt will reduce the likelihood of serious injury in a car accident.系安全带可以降低在车祸中受重伤的可能性。
likely
a.可能的，有希望的;适合的 ad.可能It could have been an accident, but that was hardly likely(=not very likely). 这有可能是意外事故，但是可能性不大。
mechanic
n.技工[-s]力学，机械学[ pl.]过程，细节
a garage mechanic汽车修理厂的技工
mechanical
a.机械(制造)的;力学的;呆板的
The flight has been cancelled due to mechanical failure .由于机械故障，航班被取消了。
mechanism
n.机械装置;机制，机理;办法，途径
the brake mechanism刹车装置
