1. These four causes do not operate singly . 这四个原因并不单个起作用。
2. Do you teach your students singly or in groups? 你教学生是个别地教还是按组教?
3. Laser beams have been used on marble before, but singly they leave the marble with either a yellow cast or a gray one. 过去也曾在大理石上使用过激光柱,但唯一的缺点就是:会在大理石上留下黄色或灰色的痕迹。
英英解释
adv.
1. one by one; one at a time
2. apart from others