economic value

1.I want to plant the slopes of the hills with trees of economic value.

我想在山坡济树木。

2.The rock breaking without smoke,dust,slungshot,noise and any internal injury can reduce environmental pollution and energy consumption,which has great economic value and social sense.

在岩石破裂的过程中,无烟、无、无飞石,无噪声及无任何岩石内伤,可环境污染,降低能耗。