使用发自可信的证书授权中心的数字证书(数字id)，连同ssl加密，可为交易中的各方提供很高等级的安全保障。

Using a Digital certificate (Digital id) from a trusted certificate authority in conjunction with SSL encryption provides a very high grade of security for all parties involved in a transaction.

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在英国，能教数学老师的资历要求十分低，只需要在(英国)普通中等教育证书拿到C等级就可以从事教育工作。 而在日本，从事同样性质工作的数学老师必须得拿到相关数学专业的学位证书。

Maths teachers in English primary schools need only a C grade at GCSE in the subject, while many teaching at the same level in Japan have a maths degree.

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