Permaphase
带硅氧烷聚合物层的色谱固定相
🗣️ 情景例句
This job is hard work.
这活儿太累人了。
One father is more than a hundred school-masters.
一个父亲胜于一百个教师。
We owe a lot to the birds and beasts who eat insects but all of them put together kill only a fraction of the number destroyed by spiders.
我们要十分感谢那些吃昆虫的鸟和兽，然而把它们所杀死的昆虫全部加在一起也只相当于蜘蛛所消灭的一小部分。