The trade imbalance is likely to rise again in 2007. Hence a new set of policy actions will be required soon.

贸易不平衡在2007年可能会再度上扬。因此需要很快采取一系列新的政策行动。

European music happens to use a scale of eight notes, hence the use of the term octave.

欧洲音乐碰巧使用八音符节律，由此人们开始使用“八度”这一名称。

The gases that may be warming the planet will have their main effect many years hence.

这些可能正在使地球变暖的气体，其重要影响将在许多年之后显现。