Over time, the buildup of these particles provides enough thrust for a small spacecraft to travel in space.
在不久的将来，这些原子的建设将提供足够的推动力让小航空器在太空航行。
2
The labor was obviously hard on him. He was an old man, and each time he thrust his spade into the ground to turn the earth, he heaved heavily.
这是一位老人，农活显然是艰苦的，他每锄地一次，都要沉重地再次举起铁锹。
3
She had hideous hair, of a reddish blond which was turning gray, and which she thrust back from time to time, with her enormous shining hands, with their flat nails.