复数： nineteens

I first heard about him when I was nineteen .

这是我十九岁的时候第一次听说的事情。

She was nineteen years old , and todd was twenty .

她十九岁，托德二十岁。

But by nineteen months , on average , grasping is replaced by pointing .

但是平均到了十九个月大，抓住被指认替代了。

The reaction of nineteen hours a day for many days was strong upon him .

那是每天十九小时连续多少日子的劳动对乔所产生的激烈后果。

Epilogue nineteen years later autumn seemed to arrive suddenly that year .

尾声十九年之后秋天好像来得很突然。