灵活缴费(一定时期内多次缴费)。

Flexible premiums (several payments over time).

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在一定时期内，这具有一定的社会问题。

This is a period of time, society has certain problems.

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但是，高失业率可在一定时期内限制增长。

But high unemployment could limit growth for some time.

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污染已经成为一定时期内时间范围内的一个严重问题。

Pollution has been a serious problem for a certain time around the world.

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根据一定的工资标准，员工在一定时期内的基本收入可以是。

The base employee income for a specified period, based on pay rate. Can be.

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洪水频率(或重现期)是指一定时期内某种洪水出现的机率。

Flood frequency (return period) is referring to recurrence probability of flood in certain period.

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洪水频率(或重现期)是指一定时期内某种洪水出现的机率。

Flood frequency (return period) is referring to recurrence probability of flood in certain period.

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