Chie
[机械]小型多级卧式变频泵
🗣️ 情景例句
parents are invited to attend--
家长被邀请来参加
To negotiate the agreement
商议同意
It was necessary, therefore, to invent instruments that neither slumbered nor slept.
因此，有必要发明一种仪器，既不打盹儿，也不睡觉。