And if we don't return 假如最后不能再回归
If we don't have exactly one item selected, we disable the action, adjust the tool tip to say why it is disabled, and return.
如果选中的不是恰好一项，则禁用该操作，调整工具提示以说明为什么禁用，然后返回。
If we don't quit using coal, oil, and natural gas soon, then as early as 2055 or as late as 2088, we won't have any power. We will have passed a point of no-return.
如果我们继续使用煤炭、石油、天然气等化石燃料， 那么等到2055年，最晚2088年，我们将没有能源可用，到那个时候就没有任何可回转的余地了。
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