公共汽车(或公共马车，长途汽车)是一种大型的公共运输工具，用来搭载大量的乘客，有时也附加的运输少量的货物。

A bus (or omnibus or coach), which is a large public conveyance designed to carry a large number of passengers and sometimes additionally small amounts of cargo.

youdao

2002年，西北大学的James Speta的一篇论文中列出了三个充分地将公共运输工具应用于调节价格和使用权的历史证据。

In a 2002 paper James Speta of Northwestern University laid out three broad historical justifications for applying common carriage to regulate prices and access.

youdao

首先，多数运输者更青睐于一个自然的或者国家允许垄断的公共运输工具，并且应被严格限制，以防止运用其时出现不确定的情况。

First, many transporters enjoy a natural or state-granted monopoly and need to be restrained from exercising it with too much abandon.

youdao