And coal, the dirtiest of all energy sources, is still by far the cheapest.
而且时至今日，煤炭——污染最严重的能源——还是保持着价格最低的优势。
Slow as the mail is, it is the cheapest means of communication.
尽管慢，但这是最便宜的通信方式。
Although the mail is slow, it is one of the cheapest means of communication.
虽然邮件的速度很慢，但是他是最便宜的沟通工具。
Although the mail is slow, it is one of the cheapest means of communication.
虽然邮信很慢，但是邮信却是最便宜的一种交流方式。
The cheapest way to observe the tradition, of course, is at home.
最便宜的遵循传统的方式，当然是在家里。
Although the mail is slow, it is one of the cheapest means of communication.
虽然邮件速度很慢，但是它是最便宜的交流手段之一。
In addition, wind is now the fastest-growing energy source worldwide and one of the cheapest.
另外，风是现今世界上增长最快的能源，也是最便宜的能源之一。
This is already the cheapest of the!
这已经是最便宜的了！
I want to see the sample of the person that is the cheapest.
就再好不过了。我想看看哪家的雨伞样品价格最低。
I want to see the sample of the person that is the cheapest.
就再好不过了。我想看看哪家的雨伞样品价格最低。
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