1. Similar machines have flown in space aboard NASA's shuttles, but they couldn't be tested for long enough to prove whether they were effective. 类似的机器也曾搭乘美国宇航局的航天飞机在太空中飞行，但无法进行时间足够长的测试来证明它们是否有效。
2. A bus shuttles passengers back and forth from the station to the terminal. 一辆公共汽车在火车站和公共汽车终点站之间往返运送旅客。
3. Self-driving shuttles and solar cars were on display at the 2014 show. 无人驾驶汽车和太阳能汽车在这次2014年展览上展出。
4. Self-driving shuttles and solar cars were on display at the 2014 show. 无人驾驶汽车和太阳能汽车在这次2014年展览上展出。
5. A winch shuttles back and forth, and side to side, on a grid of rails above stacks of containers. 一台绞车在集装箱堆上方的轨道网上前后、左右穿梭。
