Tetradentate
四配位基的
🗣️ 情景例句
Sunday. Why?
星期天。为什么问这个？
Nothing to be got without pains but poverty.
只有贫困可以不劳而获得。
Last year we helped them with the orange-picking.We really enjoyed working on the farm.
去年我们帮他们搞苹果。我们实在太喜欢在农场干活了。