因为总会有对安全性的疑问的，但现在工作人员可以感到更安全，而且更加有效。
Because then there would always be doubt of safety, but now crews can feel more secure, and be more effective.
遵循可用性原则并让真实用户进行可用性测试，你会发现你的电子商务网站不仅仅可用，而且更加有效。
Follow usability guidelines and carry out usability testing with real users and you should find that your ecommerce website is not only usable, but very effective as well.
最人性化收费机制，按照学习时间即时计费。 课程费用远远低于目前市场上的一对一语言服务收费，而且更加有效。
The lesson fees are much lower than the current market price for other one-to-one language learning services and the system is much more effective than language CDs.
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