Stand-by
[计] 备用设备, 准备, 备用\\n[化] 备用的; 储备的; 辅助的
📖 牛津释义
stand-by
n (pl -bys)
1 person or thing available as a substitute or in an emergency 後备人员; 备用的事物
Aspirin is a good stand-by for headaches. 阿司匹林是必备的头痛良药.
[attrib 作定语]
a stand-by ticket, ie a cheaper type of airline ticket available when not all the tickets for a flight have been sold 剩余机票（因未事先售出而价廉）.
2 (idm 习语) on `stand-by in a state of readiness 待命状态
The troops are on 24-hour stand-by, ie ready to move within 24 hours of receiving the order. 部队待命24小时（接到命令後24小时内可行动）.
🏥 医学释义
①备用品 ②准备
🧩 词语组成解析
stand
[stænd]
n. 台，看台;立场;停止;抵抗;
vi. 站立，起立;竖直放置;保持看法;停滞;
vt. 使站立;忍受;抵御;承担责任;
vt.& vi. 站立，（使）直立，站着;
by
[baɪ]
prep. 在…旁边;表示方式;由于;经过;
adv. 经过;表示保留或保存时用;短暂拜访;
🗣️ 情景例句
No, he never did.
没有， 从来没有。
True love shows itself in time of need.
急需时见真情。
If one law is changed, then people will later want to change other laws.
要是变更了一条法律，那么人们还会要变更别的法律的。