地球并非刚体，其对力的响应必须用适用于可变形介质的方法来处理。

Love doesn't need a reason. It speaks from the irrational wisdom of the heart.

Never ask a barber if you need a haircut.

Death in itself is nothing; but we fear to be we know not what, we know not where.

最好的水果来自最好的实践；绝不能在标准上妥协。