Topics
abbr. 总联机程序和信息控制系统（Total On-line Program and Information Control System）
🗣️ 情景例句
When you see a new word, look it up.
当你看到一个新的字时就去查阅它。
I wasn't born yesterday.
我又不是三岁小孩。
For one thing they keep the water clean.
一来，水下植物可以保持水的清洁。