生意好时我每月可赚三四千块钱。

In a good month I might earn RMB3000 to 4000 selling kites.

三星堆文明，应从其所在的三四千年前的古气候考察为立足点，以持续性干旱、突发性洪水和山区冰川活动的灾害性现象为特征进行分析、研究。

The study of Sanxingdui should take the investigation of weather three or four thousand years ago as the stand and analyze the durative drought, sudden flood and glacier movement.