额外的守卫

extra care───额外的照顾；格外小心

extra burden───额外负担

extra cash───额外的现金

extra hours───额外时间

extra space───额外的空间

extrasolar───adj.[天]太阳系以外的

rear guard───后卫部队；殿后

crowd at the gate got thin and the extra guard waved to Scotty as he moved off in the opposite direction.───大门口的人群渐渐稀少了，那另外一个辅助警卫向斯科蒂挥手致意，以相反的方向走开了。

at the gate got thin, and the extra guard waved to Scotty as he moved off in the opposite direction.───门口的人越来越少了，另外那个保安员朝司各迪挥了挥手往相反的方向走了。

Janet retreated to the doorway of the building, as a rule, she did not leave so early and had forgotten that an extra guard was stationed at the gate at this hour.───珍妮特退回到大楼的门口道上，一般来说，她是不会走得很早的，她已经忘记了在这个时候有另外一个警卫在大门口守卫着。