1.held hostage 劫持人質

The class was held hostage by a hooded gunman.

全班學生被一名蒙面持槍歹徒挾為人質stlPt~SfWRmb,p=7f|6+。

2.reckon 認為

Some people reckon that space exploration is a sheer waste of time and money while a majority of other people believe that it is of great importance.

有些人認為太空探索純屬浪費時間和金錢，但是大多數人認為太空探索有著非常重要的意義Ka6WZA=LW=-7h。

3.bounce off 彈開，反彈

Short sound waves bounce off even small objects.

短聲波即使遇到小物體都會產生回音z;jOU[]&)h@=xY1q。

4.upshot 結果，結局

The upshot could be a much bigger bubble in the future.

結果可能是日后出現更大的泡沫LAangLj@of。