Live Telnet, FTP, rlogin, RSH, and related services, in particular, can be excused only very, very rarely; they're simply too hazardous.
特别值得一提的是，尽可能少使用实时的telnet、ftp、rlogin和rsh以及相关服务；它们实在是太危险了。
One is black carbon and the other is ozone, which is vital for blocking ultraviolet rays in the stratosphere but hazardous in the bits of the atmosphere where plants live and people have to breathe.
其一是黑碳，另一样是臭氧，后者对阻止平流层的紫外线起着至关重要的作用，但对大气中的植物和人类有害。
One is black carbon and the other is ozone, which is vital for blocking ultraviolet rays in the stratosphere but hazardous in the bits of the atmosphere where plants live and people have to breathe.
其一是黑碳，另一样是臭氧，后者对阻止平流层的紫外线起着至关重要的作用，但对大气中的植物和人类有害。
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