It is mandatory retirement that frustrates the elder staffs who still want to make contribution to the society.

强制退休让那些还想继续为社会做贡献的老年员工感到沮丧。

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Non-power influence of library administrator is a kind of capability combined with personality, wisdom, experience, contribution and authority. It is non-mandatory, potential and inspirable.

图书馆领导者非权力影响力是由领导者个人的品格、才能、智慧、经验、贡献和威信等因素构成的支配力量，具有非强制性、潜在性、感召性。

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In addition, some workers might see a mandatory contribution to their personal unemployment-support account as a long-term investment, not as a tax.

ECONOMIST: Against the day when you lose your job

Most defined-benefit schemes have either a set retirement age or a mandatory number of contribution years before a full pension can be drawn.

ECONOMIST: All hands on deck

The question has been argued for months: should online politicking be regulated the same way traditional politicking is, with contribution limits and mandatory donor disclosure?

NPR: Internet Covered by Campaign Finance Laws