MOT

例句：

1. 1. The car is a great source of transportation.
   汽车是一种很好的交通工具。
2. 2. The engineer designed the new machine for efficiency.
   工程师为提高效率设计了新机器。
3. 3. Tools are essential for completing tasks efficiently.
   工具对于高效完成任务至关重要。