Meniscoid
a. 新月形的,凹凸的
🗣️ 情景例句
I have always envied your good luck.
我一直羡慕你的运气好。
I couldn't help it.
我没办法。
Similarly, our own present primitive chemical rockets, though good enough to orbit men,
同样，我们目前使用的原始化学火箭，虽然可以把人送入轨道，