Staged vehicle
多级火箭
🧩 词语组成解析
a. 分期的
🗣️ 情景例句
about finding homes for the animals?
为动物寻个家。
I feel guilty because I haven't written her lately.
因为我最近没给她写信，我感觉到有罪。
Without it we could not make a living.
要是没有这条河，我们就无法生存下去。