“然而我们只有一个地球，这使得问题更加明朗化，”吉尔丁这样说道。

“Having only one planet makes this a rather significant problem, ” says Gilding.

youdao

想像一下，我们要拍摄一个在足球场上的片段，而我们只有一个10*5的房间，但我们可以通过调整房间大小来满足足球场的尺寸。

Imagine if we were shooting on a football field, and we have a room, which is maybe 10 meters by 5; we can scale that room up to fit the football field.

youdao

一个帖子，受益的是Lifehacker的全部读书，然而一封邮件的受益人仅是那个收件人，而我们只有那么多时间。

A post benefits all of Lifehacker's readership, where an email only benefits the recipient, and we've only got so much time.

youdao

At this point, we have no other choice but to double up before going to the next energy level, 2px so we'll put a second one in the 2 p x.

在这点上我们没有其他选择,而只有双倍填充,在到下一个能级之前，所以我们放入第二个电子至。

麻省理工公开课 - 化学原理课程节选

I want to point out that the zero energy is defined as when you have a naked proton -- where the electron has popped out -- that's what we've defined as zero energy up to this point when we're talking about single atoms.

我想指出，这里零点能的定义,是当我们只有一个裸露的质子,而没有电子时-,到目前为止对零点能一直采用这样的定义,当我们在讨论单个原子时。

麻省理工公开课 - 化学原理课程节选