Ocs
abbr. （美国）候补军官学校（Officer Candidate School）；超速控制系统；振荡彩色顺序
🗣️ 情景例句
Which tourist attractions are the best?
哪一个旅游景点最好？
She must be a model, isn't she?
她一定是个模特，不是吗？
Some children were playing games on the bank and there were some people rowing on the river.
河岸上有些孩子正在玩耍，河面上有些人正在划船。