Once you think about it you will realize that one or two, if not all three were likely to have happened by chance.

一旦你想到它，你就会意识到一件或两件事，如果不是全部三件事，都有可能是随机发生在你身上。

youdao

Once we have one object, there are two ways to create any child data objects.

有了一个对象之后，即可通过两种方法来创建子数据对象。

youdao

You can also add one teaspoon of green leafy vegetable juice to your baby's milk bottle once in two days.

你也可以两天一次地加上一茶匙的绿叶蔬菜汁到你宝宝的奶瓶上。

youdao

"It may cost one or two seats to be lost in tough districts, but I think once people really find out what this bill does and how good a job he's done and the Democrats have done, I think they may very well pick up some seats."

VOA: standard.2010.03.25

One thing that I want to mention that is really important is once you have double bonds, what happens between those two atoms in the molecule is they can no longer rotate in relation to each other.

我要提醒你们的非常重要的一点事,一旦有了双键，分子中的两个原子,就不能相对旋转了。

麻省理工公开课 - 化学原理课程节选

Rather than trying to improve all dimensions at once, I encourage companies to focus only on one or two critical items with each survey cycle (another reason to ideally conduct them once or twice a year).

FORBES: Employee Survey Success: The 3 A's of Employee Satisfaction Surveys

The Ali shuffle, once a prelude to devastating one-two punches, now mean something entirely different.

NPR: Boxer Muhammad Ali Turns 65

Once it had been decided to keep at least one of the two new aircraft-carriers under construction, the idea that Britain should give up flying jets from them for a decade made little sense.

ECONOMIST: Why scrapping the Harrier aircraft looks like a mistake