Ptm
n. pulse-time modulation的简写
🗣️ 情景例句
If you want a surprise,
如果你想要一项惊喜的事，
The world is a ladder for some to go up and others to go down.
世界好似一把梯，有人上去有人下。
Compared with competing products, ours is smaller and lighter.
比起其它竞争产品，我们的比较轻巧。