重點講解：
1. thanks to 幸虧；歸因于；
例句：Painful typhoid injections are a thing of the past, thanks to the introduction of an oral vaccine.
自從發明了口服疫苗后，令人痛苦的傷寒疫苗注射就成為了過去9%Bq3tzo&luMSTHXgAX)。
2. at first 最初；起初；開始時；
例句：I tried not to take any notice at first but then I was offended by it.
起初我盡量不予理會，但后來我被惹惱了1iw38b9;656)G。
3. clear out 清理，整理；
例句：I took the precaution of clearing out my desk before I left.
我臨走時特地事先把辦公桌清理了一下_[^hW8Mp~l&DCm。
4. take off (突然)離開，走開，走掉；
例句：I had better take off.
我最好告辭了rQhJ4jQfsOkx。