English to Chinese Tech/Engineering IT (Information Technology)

Mobile IM seemed more promising, thanks to the popularity of text messaging. However, the main users of text messaging are children attracted by its low cost and busy people who like its asynchronous nature, which allows them to send quick messages without getting tied up in a long phone call. The former won't pay extra for IM, while the latter will likely go straight to full e-mail once J2ME is commonplace.
试译：
移动即时通信（IM）似乎更有潜力，这归功于流行的文本消息传送。不过，文本消息传送的主要用户是被吸低廉费用吸引的孩子和喜欢其不同步性的工作忙碌的人。这样一来，他们不必打长时间的电话，就可以迅速发送消息。前者不会为IM另外付费，而后者一旦等到J2ME普及，很可能直接使用电子邮件。
This leaves enhanced voice, and in particular Private Mobile Radio (PMR), a service that emulates a walkie-talkie. Police officers, taxi dispatchers, and other people who need to stay in touch with a predefined group of colleagues have been using PMR long before cell phones were invented, but in the last few years it's been made famous by Nextel, which combines PMR with telephony.
试译：
这给了增强型语音以机会（？？？），尤其是专用移动无线电（PMR）这项模拟对讲机的服务。早在移动电话发明之前，警察、出租车调度人员以及需要跟事先设定的一群同事保持联系的其他人一直在用PMR。不过最近几年才被Nextel加以推广，Nextel把PMR和电话结合在一起。