这是尼克尔，值五分。

This is a nickel, worth five cents.

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而对于结构为{+ 7}的锂元素，根据标准理论提出的理论值，天文学家们已经检测到了三分之一至五分之一的量存在。

As for {+ 7} Li, astronomers have measured only one-third to one-half of what the standard theory suggests should be there.

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作为一个指导原则，您可以使用一个五分钟的值作为检测回复的最短期限，超过此限制将拒绝回复。

As a guideline, you can use a value of five minutes as a minimum to detect, and thus reject, replays.

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