积雪

I have never been more bored in my life than when listening to an old gentleman explaining to an old lady the several ways in which she might have come from Notting Hill Gate to Hampstead.

我一生中感到最厌烦的一回，是听一位老先生向一位上年纪的女人讲解，她从拿丁山门回汉普斯台可能走的全部街道。

If you specify multiple -D directives, you can concatenate the symbol lists.

如果你指定了多个"-D"选项，你可以联接它们，如下