立刻; 立即; 同时; 一起;at once: (immediately, very soon, right away)【说明：】at once （立刻，马上）为一级通用的副词片语，也可以作为同时(simultaneously) 解，如：This book is at once interesting and structive. （此书既有趣又有益。）【例：】(1) He asked me to come to his office at once.他请我立刻就到他的办公室去。(2) I want you to send this telegram at once.我希望你马上把这电报发出去。
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