选择一些主要的目标并为之奋斗。

Choose a few major goals to work toward.

youdao

美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。

Pecans are the only major tree nut native to the U. S., which produces about 80 percent of the world's crop.

youdao

美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。

Pecans are the only major tree nut native to the U.S., which produces about 80 percent of the world's crop.

youdao

In terms of cost to institute this, the upfront cost to build classrooms, to accommodate this kind of structure, we need two classrooms that hold 170 students a piece to do this.

关于建这个项目的成本，最主要的就是搭建教室，使之适应这种教学模式，我们需要两间能装170人,的教室来上这种课。

麻省理工公开课 - 媒体、教育、市场课程节选

So there will be parts of the class that'll be easier for some than others, but overall I'm not expecting you to learn a lot of detail but mainly the big picture, as I said.

所以我们的课程对大家来说,有的觉得困难,有的觉得容易,但总而言之,我不要求你们纠缠于细节,主要还是抓重点,我之前说过了

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

And that's our obligation to send them to war only when we have to, and only when we know they can actually achieve their mission is a key difference between what I advocate and what the neo-cons advocate.

我们有义务,在必须的时候，送他们上战场，我们必须确保,他们一旦奔赴战场就能完成使命,这是重大的不同,我和新型保守派主张的不同之处主要在此。

普林斯顿公开课 - 国际座谈会课程节选