start at

基本解释

To place your objects in the scene, you start at point (0,0,0), and then move the objects wherever you want.
为了把你的对象摆放到场景中，你开始于点(0, 0, 0)，然后把对象移动到你想要的地方。
Some people use their time and money badly and start at the top only to work down to the proper level of their poor abilities.
有些人滥用他们的时间和金钱，开始时地位很高，以后只好走下坡路，降到跟他们的低能相当的地步了。
I'm not thinking about stopping yet, but most players start at 20 and if they finish at 29 nobody will say they've had a short career.
我还没有想过退役，但大多数球员在20岁开始比赛，如果他们在29岁时退役，没有人会说他们的职业生涯很短暂。

The new testing and counseling campaign will start at a single location in each of South Africa's nine provinces this month.
We start at p1, V1. and p external is equal to zero.
从状态开始，外部压强为零。
麻省理工公开课 - 热力学与动力学课程节选
I usually start at that eating club. But they're under renovation right now.
我通常参加类似的一个饮食俱乐部。但现在他们在装修。
有趣的吃东西协会 - SpeakingMax英语口语达人

As I said on Tuesday night, that education has to start at the earliest possible age.
WHITEHOUSE: President Obama on Early Childhood Education