A microorganism is too small to see with the naked eye.
微生物太小,不能用肉眼看见.
At this stage there is a latent image which is not yet visible.
这一阶段便形成肉眼仍不可见的潜像.
Gross crystalline imperfections like twinning are apparent to the unaided eye.
粗的晶体不完整性,如孪生体可用肉眼看出.
Appearance: Yellowish powder, no impurity naked eye can see.
外观: 呈淡黄色粉末, 无肉眼可见夹杂物.
PIQUE: Inclusions easily visible to the naked eye.
PK级: 用肉眼就可明显地看到内含物.
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