I have large, heavy, rubber drain plugs on all of them but there are days where it just doesn't help and we get really strong odors of rotten onions coming into out bathrooms. It can be really disgusting.
I find that Taobao - with JD and others on there - while in Chinese, are still fairly easy to navigate. They usually have the specs in English (and, often, a jpg of the English promotion materials for the products).
Failing that, if you have a translation program (including just using Baidu Fanyi), you can C&P the bits of Chinese relevant to various stats... such as making sure you're looking at L3 cache rather than video ram.
One problem that Taobao and its ilk to have - often there are different prices listed for what appears to be the same machine - those are the various upgrades you can get with it... usually HDD, but sometimes RAM or even video card.
HK is much easier all around....