They believe that the best we can do is keep it at a reasonable level, and at present the only serious option for doing this is cutting back on our carbon emissions.

他们认为，我们所能做的最好的事情就是把它控制在一个合理的水平，而在这方面目前唯一重要的选择就是减少碳排放。

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Doorways and alcoves on street level are a better option.

大街上的门道和门洞是个更好的选择。

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Sets the system security Settings to the level specified with this option.

将系统安全设置指定为该选项指定的级别。

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Morrell said the general's request will contain further analysis and a range of force level options for the president to consider, along with a statement of the risks of each option.

VOA: standard.2009.09.23

Applause goes to Dell for giving users an affordable option for an entry-level Ubuntu-powered gaming system.

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That option can start at whatever level is feasible at first.

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The VIXIA HF G20 camcorder includes a variety of high-level features that make it an excellent option for users in search of a user-friendly camcorder with professional-level functionality.

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