易混淆的单词： Gelder

Van gelder recommended installing new drain piping so the experiment could begin with a clean slate .

vangelder推荐安装新的排水管，这样试验就可以有清白的前科方便参考。

It asked roger van gelder , a water conservation consultant and proponent of the urinal technology , to do the evaluation .

学校咨询了rogervangelder，一个水资源保护顾问和小便池技术的拥护者，进行评估。