at once at the most

Data streaming is achieved by working on part of the data at a time, rather than all or most of the data all at once.

数据流是通过每次使用一部分数据，而不是一次性地使用全部或大部分数据实现的。

In addition to looking at who uses Twitter, Pew examined how they used Twitter and found that 65% of Twitter users check the site for updates at most once or twice a week.

此调查除了探寻都是哪些人在使用Twitter以外，同时研究他们的使用习性。 数据显示Twitter用户的65%登陆这个网址更新信息的频率仅为每周1到2次。

He was a great proponent of simplicity, saying once, “An architect’s most useful tools are an eraser at the drafting board and a wrecking bar at the site.”

他是一个伟大的简单性倡导者，他曾说过：“一个建筑师最有用的工具是草图板上的橡皮擦。”