Studies suggest that anything smaller than ten micrometers in diameter (about a tenth the diameter of a human hair) is problematic, increasing the risk of asthma, heart disease, and stroke.
研究发现吸入任何直径小于十微米(大约人类头发的十分之一)的任何东西都是有问题的，可能会增加得哮喘的风险，心脏类疾病或者中风。
The background galaxies are about one tenth the apparent size of NGC 7331 and so lie roughly ten times farther away.
背景星系的大小大约是NGC7331表面大小的十分之一，而距离上则大约是10倍甚至更远。
The background galaxies are about one tenth the apparent size of NGC 7331 and so lie roughly ten times farther away.
背景星系的大小大约是NGC7331表面大小的十分之一，而距离上则大约是10倍甚至更远。
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