call, summon, send for
这些动词或词组均含有“召集，召唤”之意。
call : 非正式用词，含义广泛，指用说话或呼叫的形式召唤。
例如：The sirens are calling the men to assemble.（警报声在召令士兵集合。）
summon : 正式用词，指官方或正式的召集，召集者具有权力或权威性。
例如：He was summoned as a witness by the court.（她被法庭传唤作证）
send for : 作“召唤”解时，语气较随便，暗示委派一件工作。
例如：Leave this house now, or I will send for the police.（现在就离开这房子, 否则我叫警察了。）
They sent for him to build the house.（他们派人叫他去建房子。）
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