每一档数字都是比前档减少一半的通孔大小。

Each aperture size (referred to as a stop) is marked with a corresponding number that represents half the light of the previous stop.

youdao

此研究对高速数字设计者深入理解导通孔设计有一定意义。

The study allows high-speed digital designers to have a more indepth assessment of via design.

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现在，观察一下主板上的插槽：该插槽应当有一个盲孔或是一个数字1来指示针1的位置。

Now look at the socket on the motherboard: this socket should have a missing hole or should have a 1 indicating pin one.

youdao

This is a game where you get a little plastic device, it's got 15 plastic numbers on it and one hole in this little plastic board and you can move those numbers up, down, left to right, and the goal is to take what's a random assortment of tiles and arrange them in numeric order and that's one of these little things you can play sort of absentmindedly.

在这个游戏中，你会拿到一个可塑的装置，上面有15个数字和一个孔,你可以将数字上下移动，左右移动，目标就是,拿到一个随机的组合后,将其按数字顺序排列,这个你可以随便玩玩。

哈佛公开课 - 计算机科学课程节选