电邮稍微非正式一点没有关系(人们最近开始接受了)，但是不要写得好像是在跟妈妈或最好的朋友谈话一样。
It's okay to be slightly informal with your E-mail (people tend to expect it lately), but don't write as if you're talking to your mother or best friend.
这个长期靠着非正式的信任关系来维系统治的国家看来开始有点动摇。
A country that has long been governed by informal bonds of trust is seeing them start to fray.
很高兴参加欧洲议会对华关系非正式对话会。
I am very pleased to participate in this informal dialogue with the European Parliament on China.
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