It hurts so much when a baby gets his first teeth.
小孩子长第一颗牙齿时好痛哟。
The worth of a thing is best known by the want of it.
物以稀为贵。
The guests had, of course, realized this from the moment Bessie opened the door for them and, long before the final catastrophe, had had a difficult time trying to conceal their amusement.