Hco
abbr. 重循环油（heavy cycle oil）
🗣️ 情景例句
So just relax.
所以 ，放轻松点。
We went to a concert last night to hear the symphony orchestra.
我们昨晚去了一个音乐会听交响乐乐队演奏。
They quickly loaded a small rubber dinghy with food, matches, and cans of beer and rowed for a few miles across the Caribbean until they arrived at a tiny coral island.
他们迅速把食物、火柴、罐装啤酒往一只救生筏上装。然后在加勒比海上划行了几英里，到了一座珊瑚岛上。