You want to have a pony, but you don't want the pony to eat the grass: But today, with the dramatic expansion of the human population and the pressure on the natural environment so intense, on the one hand people want to have these animals around to eat and utilize, but at the same time are developing (invading?)
要馬兒好，又要馬兒不吃草但今天人口劇增、自然環境的開發壓力如此之烈，人們一方面要吃、要用，一方面又拚命開發（侵佔？）