1.roll back （使）滚回，（使）卷起来；使退却，使后退；（政府）把（物价、生活费用等）压低到原来的水平，使回降

例句：They rolled back the carpet and had a dance.

他们把地毯卷起，跳起舞来。

2.roll in the aisles （使）捧腹大笑

例句：I am tired of seeing action movies. I just want something that willmake me roll in the aisles.

我对动作片已经厌倦了，只想看一些能让我捧腹大笑的电影。

3.roll over 从（边）上滚下；翻转，侧转，（使）翻滚

例句：They baby rolled over the edge of the bed and fell down.

婴儿滚过床边掉了下来。

4.roll up one’s sleeves 卷起袖子（准备打架）

例句：One could no more do that than one could roll up one's sleeves andgo down into the muck.

一个人不能那样做，就如同不能卷起袖子下到污泥里去一样。

5.roller skate 穿四轮溜冰鞋滑行

例句：A boy of about ten came up on roller skates.

一个大约十岁的男孩穿着双排四轮旱冰鞋滑了过来。

6.room and board 膳宿

例句：Participants receive free room and board while they are in theacademy.

参加者在这家学院时，他们得到了免费食宿。