If more than one species is competing for a scarce resource, the competing species usually switch to different alternative resources.

如果一个以上的物种竞争稀缺的资源，竞争的物种通常会转向不同的替代资源。

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Considered to be a less dangerous alternative to tobacco, "e-cigarettes" are taking over the West as more and more people switch over when trying to kick the habit.

随着越来越多的人开始戒烟，被认为危险程度更小的替代物——电子烟在西方国家流行起来了。

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Other alternative input devices include single switch devices, devices that track head movements, and alternative keyboards for persons with mobility impairments.

其它可选择的设备包括单一切换设备、跟踪头部移动的设备，和用于行动困难的人可选择的键盘。

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Some advised users to switch to alternative browsers, such as Google's Chrome or Mozilla's Firefox while the bug was being fixed.

BBC: Microsoft warns on previously unseen IE bug

Whereas Zhang's family used to spend hours seeking, chopping and carrying firewood, the switch to alternative energy has enabled them to save the equivalent of 100 working days, he estimated.

CNN: 'Green' revolution under way in rural China

And any consumer who is dissatisfied with Google Image Search can switch to an alternative in a matter of seconds.

FORBES: The Weak Antitrust Case against Google