不管年龄是多少，任何成像过程的一个引导原则就是辐射应该受限制——或“锥形”——对于被检查的部位来说。

A guiding principle for any imaging procedure, regardless of age, is that radiation should be limited - or "coned" - to the area being examined.

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尼古丁会导致血管收缩，血管的收缩将会限制富氧血液流向面部和身体其他部位的细微血管。

Nicotine causes vasoconstriction, a narrowing of the blood vessels that can limit oxygen-rich blood flow to the tiny vessels in the face or other parts of the body.

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某些旧系统存在限制，BIOS仅能通过全部位于磁盘的前1024个柱面中的分区引导。

Some older systems have a limitation that the BIOS can boot only from a partition that is wholly located within the first 1024 cylinders of disk.

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