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China also has other means of retaining control of the market besides export quotas .

除了限制出口配额以外，中国还有其他对稀土市场保持控制的办法。

China 's rulers too have long been worrying about retaining the support of the middle class .

如何保持中产阶级的支持，这也一直是中国执政者所担忧的。

This reduces their chance of causing overexposure while still retaining information about highlights in the picture .

这削减了他们引起过度曝光的几率，而仍然保持对照片中高光部分的信息的留存。

There are no easy solutions to stop the untold damage while retaining our reasonable freedoms of choice .

要停止这些不胜枚举的破坏，同时保持合理的选择自由，没有轻松的解决办法。

In this view , publishers and booksellers have an interest in licensing e-books and retaining control over their distribution and secondary uses .

从这点看来，出版商和书商对有许可的电子书且能够持续保持对这些电子书的发布及二次使用的控制感到很有兴趣。