combined improvement的用法和樣例：
例句
- The desirability of combined industrial and municipal waste treatment can be debated endlessly on a theoretical basis.
工業(yè)和城市污水聯(lián)合處理的合理性，在理論上尚有爭議。 - The second advantage is that combined treatment enhances the biological waste treatment processes.
第二個(gè)優(yōu)點(diǎn)是，聯(lián)合處理促進(jìn)了生物凈化過(guò)程。
