On-call
待命；随叫随到；即期支付
🧩 词语组成解析
on
[ɑn]
prep. （表示方向）向;（表示对象）对;（表示位置）在…上;（表示时间）在…之时;
adv. （放，穿，连接）上;向前，（继续）下去;
adj. 活动着的情况，状态;使用着的;发生着的;计划中的;
call
[kɔl]
v. 呼唤，喊叫;召唤，叫来，召集;下令，命令;打电话给;
n. 喊叫，大声喊;电话联络;必要，理由;要求;
🗣️ 情景例句
I made a lunch date with him and his daughter weeks ago.
几星期前我约好和他以及他女儿共进午餐。
Drunken days have all their tomorrows.
今日花天酒地，明日潦倒穷途。
He was very healthy and happy, but he could not look after himself.
他很健康，非常欢快。但不能照料自己。