General Wardak explained that, on election day,the domestic and international forces are preparing "for the worst possible scenario" and will have four-tiers of security in place.

VOA: standard.2009.08.16

In the 80s and the 90s, you had a very... economic system was very... you had a lot of tiers.

在八九十年代，你有一个很……经济体制很……分很多层次。

纽约的负面变化 - SpeakingMax英语口语达人

In the 80s and the 90s, you had a very... economic system was very... you had a lot of tiers.

在八九十年代，你有一个很……经济体制很……分很多层次。

纽约的负面变化 - SpeakingMax英语口语达人