Too much tea will brown your teeth, but it's good for your health; so what are you going to do?
茶喝多了会把你的牙齿染黄,但对你的身体去有好处。因此你会怎么办?
About once a month. Not too often, because neither of us has much time. We both have too much work to do.
大约每月一次。不太经常写信,因为我俩的时间都很紧。我们都有做不完的事。