But almost 20 percent of that is not useable.

但其中近20%是不可用的。

Should we need to evacuate, move quickly to the nearest useable exit.

如果需要撤离，请迅速移动到最近可用的出口。

New foods become available and useable only once they can be boiled.

通过煮沸，就出现了很多可食用的新食物了。

And that makes it possible to cultivate fresh produce where there is no useable soil.

这种方式可以在没有土壤的情况下种植新鲜的农作物。

Something that can be a brand-new mode of transportation, that's useable by folks every day.

它可以成为一种全新的交通方式，成为人们每天都可以使用的东西。

Satellite images would not show if the green spaces are actually useable, such as playgrounds and parks.

星图像并不现实绿色空间是否有用，比如操场和公园。

Although it's present in common substances like water, it's not directly useable in that form.

尽管它存在于水等常见物质中， 但不能以这种形式直接使用。

But if we look even further into the future, there will be less useable land to grow crops like tomatoes and carrots.

但是，如果我们进一步展望未来，就会发现种植西红柿和胡萝卜等农作物的可用土地将越来越少。

Ozawa adds that in the United States many cities and towns pick up trees after the holidays and process them into a useable product, like small wood pieces for the garden.

小泽还说，在美国，许多城镇在节后捡起树木，将它们加工成可使用的产品，比如用于花园的小木块。