重点讲解：
1. covert into (使)改变；更改；(使)转变；
The signal will be converted into digital code.
信号会被转变为数字代码;gVs%NFsoT4.%wFAfI%。
2. owe to 由于；因为；
He was out of work owing to a physical injury.
他因为受伤而失业了O;ksK6&5Z5[Wl。
3. be due to 由于；因为；
The country's economic problems are largely due to the weakness of the recovery.
该国的经济问题很大程度上是因为复苏乏力67fLyDlCD6(,G5Hr。
4. pertain to 与…相关；属于；适用（于）；
The restrictions he imposed pertained to the type and height of buildings and the activities for which they could be used.
他限制的是建筑物的种类和高度以及它们的用途boRE)Wq+Bv#eQv。