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[医]快反向，急速返回
🧩 词语组成解析
snap
[snæp]
vt.& vi. 猛地咬住;呵斥;折断;
vt. 拍照;用子母扣扣;[棒球]快速传（球）;拍…的快照;
n. （树枝等的）突然折断;严厉的话;突然的撕咬;尤指关上或断裂的声音)啪嗒声;
vi. 啪啪作响;（目光）闪耀;（牙齿等）咯咯作响;（精神）突然崩溃;
adj. 容易的;喀嗒一声扣下的;仓促的;
adv. 噼啪作响地;啪嗒一声;猛然;
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[bæk]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背书于;下赌注于;
vi. 后退;倒退;
adj. 背部的;后面的;以前的;拖欠的;
adv. 以前;向后地;
🗣️ 情景例句
I have a tourist visa.
旅游签证。
Extremes are dangerous.
物极必反。
The sorry-looking, blackened figure that emerged, admitted at once that he had tried to break into the shop during the night but had got stuck in the chimney.
那个看来满脸沮丧、浑身漆黑的家伙从烟囱里一出来，就承认头天夜里他企图到店里行窍，但让烟囱卡住了。