VOA慢速英语:Simulation Helps Control, Manage Traffic

短语讲解：

1. About 60 students and 30 software developers observe traffic flow and manage the computer servers at all times.

at all times 随时; 每时每刻; 总是
例句：We must be able to stay impartial at all times.
我们必须经常保持公正的态度。

2. Mr. Pack says the goal is to help develop an intelligent system of road signals that will communicate with each other and with vehicles on the road.

communicate with 与…联系，与…交往
例句：I can communicate with foreigners easily.
我能轻松地和外国人沟通。
each other 互相，彼此
例句：Molecules repel each other when they collide.
当分子相碰撞时彼此互斥。