They should not use toxic materials or require too much energy input to work. They must also be able to produce grassoline at a price that can compete with gasoline.

如果希望某种技术在商业利用方面切实可行，首先在物料的预处理方面要求所得到的中间产品必须是容易发酵的糖份，产量高，浓度也较高，而且技术的实施成本还不能过高，还有生产过程中更不能使用有毒物质，不可以耗费太多能源，最后，所生产出来的草料油在价格方面必须能够与传统汽油一争高下。

youdao

So long methods not only do too much work, but they require too much work to understand!

长方法不仅完成太多的工作，也需要人们费很大的劲去理解！

youdao

They will probably get instanced in cities and use special procedural algorithms to not require too much server bandwidth.

它们会出现于城市当中，我们会使用一些特别的程序运算方式，把服务器带宽的要求降到最低。

youdao

He says they might have to modify irrigation systems or consider growing crops that do not require much rain.

VOA: standard.2009.08.30

Similarly, the Wii's tennis, bowling, golf and baseball games require players to act out the physical movements involved in each of those sports, though they do not require as much physical exertion as the boxing game.

ECONOMIST: Monitor