P. d.
[医] 棱镜屈光度, 乳头直径, 瞳孔间距离
🗣️ 情景例句
I wouldn't be surprised if your son goes to harvard.
我觉得你儿子很有希望上哈佛。
Friends are lost by calling often and calling seldom.
交往过密过疏，都会失去朋友。
The ground supported fewer plants, and the insects which lived on these plants died out.
地上长的植物少了，生活在这些植物上的昆虫就消亡了。