订阅者可以不受限制的使用这个系统，而且也不用为每一条数据缴纳费用。

Subscribers gain unlimited use of the system with no per-record use fees.

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低耕农业限制了犁的使用。

Low Till Farming limits the use of plows.

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当然，在过去，电动汽车曾面临一些问题，如有限的行驶里程和紧缺的充电站，这都限制了人们对电动汽车的使用。

Sure, in the past electric vehicles have their problems, namely, a limited driving range, and very few recharging points, which limited their use.

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Is there a limit to the type of calculator one can use during the test?

我们能在测试中使用的计算器,有没有什么限制？

麻省理工公开课 - 固态化学导论课程节选