可數名詞，復數直接加s
英英互譯：
a state of being confined (usually for a short time);
"his detention was politically motivated"
"the prisoner is on hold"
"he
is in the custody of police"
a punishment in which a student must stay at school after others have gone
home;
"the detention of tardy pupils"
近義詞
constraint約束
custody拘留
confinement拘禁
arrest逮捕
incarceration下獄