重点讲解：
1. step up 增加（数量等）；提高（速度、强度等）；
例句：The firm must step up production this year.
这个公司今年必须提高生产=,|VhC&zYzr。
2. participate in 参与；参加；
例句：We both participated in the experimental work.
我们俩都参加了这次实验工作WTp5_tDV@ao|(~=3Glt。
3. wade into 介入，干涉；
例句：They don't just listen sympathetically, they wade into with remarks like, 'If I were you...'.
他们不是只同情地倾听，而是还时不时地插话进来：“如果我是你…”
4. due to 由于；因为；
例句：The town was blacked out due to power failure.
这个城镇由于停电变得一片漆黑wDvgCjK199_D9Pn[_Bw。