As is known to all= As we all know ，... 众所周知，......
As is known to all, China is a developing country , not a developed one.
众所周知，中国是个发展中国家，而不是发达国家。
Compared with...，... 和…...相比，......
Compared with traditional letters, e-mails have many advantages, such as fast speed and free of charge.
和传统信件相比，电子邮件有很多优点，如速度快，不需花钱。
In common with sb，... 和某人一样，......
In common with you , I like to go climbing at weekends for the reason that I can relax myself as well as keep fit.
和你一样，我也喜欢在周末去爬山，因为这既可以放松自我，也可以锻炼身体。
