Most authorities agree that play is an essential part of a child's development.
大多数权威人士认为玩耍是孩子成长的一个重要部分。
This is a citywide problem that has to be addressed as an emergency.
这是个全城性的问题，必须当做紧急事件对待。
An illustration of China's dynamism is that a new company is formed in Shanghai every 11 seconds.
说明中国活力的一个实例便是在上海每11秒钟就有一家新公司成立。
A proton is an elementary particle of matter that possesses a positive charge.
质子是带正电荷的物质的基本粒子。
I've found a vase that is an exact match of the one I broke.
我找到了一只花瓶，和我打碎的那个一模一样。
that is a/an造句
And that is a preface to an idea of computational complexity we're going to come back to.
