临产后胎头下降程度的标志是

A．骶岬
B．骶尾关节
C．坐骨棘
D．骶尾关节
E．坐骨切迹

假设你是李越，你的澳大利亚笔友Eileen最近沉迷于(be addicted to)电脑游戏而不能自拔，严重影响了学习和身心健康。请你用英语给她写一封书信劝说她戒掉这一不良习惯。

注意：1. 词数：100左右；    2. 可适当增加细节，以使行文连贯通顺。

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Yours,

Li Yue