跟踪民意测验：一种民意测验方式，定期对同一取样组，如少量的选民，进行询问以测出意见的变化。

An opinion poll in which the same sample, such as a small number of voters, is questioned periodically to measure shifts in opinion.

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他取样了一组对冲基金，是1996年的331支，到8年后的2004年，其中的75%都消失了。

He looked at a group of hedge funds that numbered 331 in 1996 and by 2004, eight years later, 75% of them had disappeared.

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由于稳定性较好，筏组比单舟更适用于进行沉渣取样工作。

Rafts are generally more suitable than single boats for sediment sampling operation because of their stability .

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He looked at a group of hedge funds that numbered 331 in 1996 and by 2004,eight years later, 75% of them had disappeared.

他取样了一组对冲基金,是1996年的331支,到8年后的2004年,其中的75%都消失了

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