Translation of "Previously" in Chinese

Previously people believed the earth was flat.

以前的人以為地球是平的。

Previously, Mr Johnson also proposed banning the consumption of alcohol on public transport in the capital, which is believed to have reduced the crime rate on trains and buses.

约翰逊先生以前还倡议禁止在首都公交上饮酒，有人认为这个倡议有效减少了火车和公车上的犯罪率。