1.Thedefinition2.Causeofformation3.Theadvantage4.Thedisadvantage5.theprobleminChinaAsecondlanguageNotjustEnglishBetterlearningoflanguageandknowledge·Toguaranteebetterparticipationandcooperation·Internationalopportunities·Betterskillinwords·Goodexerciseforthebrain·Thebilingualteachersareseriouslyinsufficient.·Students'languagelevelisirregular,andteachingisfacingpracticaldifficulties.