Enviromments

函数 save 和 load 允许我们指定托管对象的环境：

save(iris, cars, file = "myIrisAndCarsData.Rdata", envir = foo  <- new.env())
load("myIrisAndCarsData.Rdata", envir = foo)
foo$cars

save(iris, cars, file = "myIrisAndCarsData.Rdata", envir = foo  <- new.env())
load("myIrisAndCarsData.Rdata", envir = foo)
foo$cars