Radiospectrography
无线电频谱学
🗣️ 情景例句
How long is this flight?
这趟飞行有多长时间？
To carry gasoline
运送汽油
After having spent whole mornings on the river, I always go home with an empty bag.
我总是在河上呆上整整一上午，然后空着袋子回家。