1.appear to 似乎

例句:To the passengers the ball will appear to float in air.
在乘客看来，球好象悬浮在空中。

2.based on 以...为基础

例句:Security program was based on calculated risk.
保安工作准备冒一定的风险。

3.talk up 大声讲；赞扬

例句:They kept the talk up until midnight.
他们一直谈到午夜。

4.right now 立刻；马上

例句:And we will send you a replacement right now.
我们会马上补寄一批货过去。