Plastic pipe is easy to install, and doing it yourself saves big bucks.
塑料管易于安装,你自己装的话会省下一大笔钱。
Is this from one of your children, Dave or were you doing it yourself?
一个杠铃片,重10磅,大卫,这是给你孩子用的?
Here's a quick overview of best practices, plus some tips for doing it yourself.
以下我们快速浏览一下这些最佳实践,此外还提供一些自己动手的提示。
So that's just a little bit of a check for yourself, and it should make sense because what you're doing is you're calculating the difference between energy levels, so you just need to flip around which you put first to end up with a positive number here, and that's a little bit of a check that you can do what yourself.
所以你们总要确保括号,离得这项是正的,这是你们自己,可以做的检查,这事很有道理的,因为你们做的是计算能量差,所以你需要调整顺序来保证一个正数,这是你们自己可以做的检查。
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