The greatest threat to our forests is not the axe, but indifference.

The speech we hear is an indication of that which we don't hear. It is a necessary avoidance, a violent, sly, anguished or mocking smokescreen which keeps the other in its place.

表达了对事物归属的豁达态度。

柴油发动机可以使用植物油作为燃料，这将极大地促进使用该技术的国家的农业发展。