在Web服务器可用的情况下，这个状态码应该是200(虽然在罕见情况下可能会是30x或40x)。
In the case where the Web server is available, this status code should be 200 (though in rare cases it might be a 30x or 40x code as well).
甚至在罕见的情况下，辅导员仅仅与需要知道的人分享信息。
Even in these rare cases, the counselor will share that information only with the people who need to know.
禽流感在人类之间的传播是罕见的，但在某些情况下，该病毒可以经家禽传染给人类。
Human-to-human transmission of avian flu is rare, but in some cases the virus has passed from poultry to humans.
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