由于部分细菌对抗生素的抗药性增强，对抗生素选择性的需求正在持续增长。
The demand for alternatives to antibiotics is growing , in response to the need to tackle bacterial antibiotic resistance .
其次，选择性教育的需求催生了民办教育的发展。
Second , the demand for sex selection spawned the development of private education .
选择性需求