Roll back price
[經] 回降價格
?? 詞語組成解析
roll
[r?ul]
vt. 輾;使（眼球等）左右轉動;（使）原地轉圈;滾動;
vi. 左右搖晃;翻滾;開始移動，啟動;
n. 名冊;滾翻;
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;
price
[pra?s]
n. 價格，價錢;代價;價值;賞金;
vt. 標價;定價;問…的價格;給…定價;
??? 情景例句
Maybe you can photogragh a class,
也許你來拍一次上課的情形，
One man makes a chair and another man sits in it.
坐享其成。
Several minutes later, the dish was again put into operation and one of the water.
幾分鐘后，盤子被成功地拽出了水面。