氢燃烧时火焰是淡蓝色，几乎不可见。

It will burn with a pale blue, almost invisible flame.

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要查看几乎不可见的左侧框架的框架属性，则必须先使它可见。

To review the frame properties of the almost invisible left frame, you must first make it visible.

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所有200种左右的灵长类动物都有黑色的眼睛和几乎不可见的巩膜。

All 200 or so species of primates have dark eyes and a barely visible sclera.

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