Stand-by
[計] 備用設備, 準備, 備用\\n[化] 備用的; 儲備的; 輔助的
?? 牛津釋義
stand-by
n (pl -bys)
1 person or thing available as a substitute or in an emergency 後備人員; 備用的事物
Aspirin is a good stand-by for headaches. 阿司匹林是必備的頭痛良藥.
[attrib 作定語]
a stand-by ticket, ie a cheaper type of airline ticket available when not all the tickets for a flight have been sold 剩余機票（因未事先售出而價廉）.
2 (idm 習語) on `stand-by in a state of readiness 待命狀態(tài)
The troops are on 24-hour stand-by, ie ready to move within 24 hours of receiving the order. 部隊待命24小時（接到命令後24小時內可行動）.
?? 醫(yī)學釋義
①備用品 ②準備
?? 詞語組成解析
stand
[st?nd]
n. 臺，看臺;立場;停止;抵抗;
vi. 站立，起立;豎直放置;保持看法;停滯;
vt. 使站立;忍受;抵御;承擔責任;
vt.& vi. 站立，（使）直立，站著;
by
[ba?]
prep. 在…旁邊;表示方式;由于;經過;
adv. 經過;表示保留或保存時用;短暫拜訪;
??? 情景例句
I'll call and find out.
我打電話問看看。
Lemonade on a hot day is very refreshing.
在暑天喝檸檬水，會使人精神抖擻。
I must go to the butcher's, too.
我還要到肉店去一下。