Double back
把...對折, 循原路折回
?? 詞語組成解析
double
['d?bl]
adj. 雙的;兩倍的;兩面派的;雙人用的;
vt. 使加倍;把…對折;重復(fù);
vi. 加倍，加倍努力;快步走;
adv. 兩倍地;雙重地;
n. 兩倍;雙精度型;
doub二，雙+le反復(fù) → 反復(fù)兩倍 → 翻倍
back
[b?k]
n. 背，背部;背面，反面;后面，后部;（椅子等的）靠背;
vt. 使后退;支持;加背書于;下賭注于;
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
You probably heard about it. We have private teachers in our holiday.
或許你已經(jīng)聽說過。我們交大的學(xué)生在假期間做家教。
Are you ready for your dessert now?
你現(xiàn)在準(zhǔn)備好甜菜了嗎？
The Karen had been sailing in a convoy to Russia when she was torpedoed by an enemy submarine.
“卡倫”號當(dāng)年在為其他船只護航駛往俄國的途中突然遭到敵方潛水艇魚雷的襲擊。