利与弊

科技的利与弊在人类文明的进程中，科技发明使人类置身于一个更为安全、舒适、便利的世界中。然而，任何一项科技成果的应用，往往隐含利与弊

There are some primary schools and secondary schools stipulate that the student bring the cellphone to school is

There are some primary schools and secondary schools stipulate that the student bring the cellphone to school is