Impurities in glass such as iron can give it a green or brown color.

VOA: special.2009.09.16

is this, kind of, green glass line in the middle of the pavement.

是一条在人行道中央的绿色线。

时间开始的地方 - SpeakingMax英语口语达人

is this, kind of, green glass line in the middle of the pavement.

是一条在人行道中央的绿色线。

时间开始的地方 - SpeakingMax英语口语达人