三倍下降

trickling down───向下滴流

drilling down───向地下钻；深度探讨

boiling down───煮浓

dialing down───调低；降低

grinding down───折磨；磨损

nailing down───确定，明确；用钉钉住

piping down───安静下来；吹哨停工

riding down───践踏；骑马赶上

When it saw its share price tripling, it could raise money cheaper by issuing new shares to pay down its debt.───当力拓看到自己的股价涨了3倍，它可以通过发行新股来融资并偿还贷款。