ahead of在…之前
例句：She left one day ahead of him.
她是在他离开的前一天离开的。
2. Since the country adopted the reform and opening up, political and economic reforms have not been completely separated from each other, otherwise economic reform would not have progressed so smoothly.
open up开放
例句：They opened the country up to trade.
他们实行国家贸易开放。
