这些虫子太小了,肉眼无法看到。
These bugs are so tiny you cannot see them with ___the ___naked ___eye.
在晴朗的夜晚,这颗行星肉眼可见。
The planet is visible to ___the ___naked ___eye on a clear night.
没有显微镜,细菌无法用肉眼观察到。
Without a microscope, bacteria cannot be observed with ___the ___naked ___eye.