Siu
abbr. 国际海员工会（Seafarers' International Union）；系统接口单元（System Interface Unit）
🗣️ 情景例句
But it is not polite to ask older people their age.
但问老人的年龄是不礼貌的。
Give me a ring at my office.
打电话到我办公室。
And anyone who gave more than a passing thought to the bottom confines of the oceans probably assumed that the sea bed was flat.
凡是稍稍想过大海海底的人大概都会认为海底是平坦的。