No one has come up with a definitive answer as to why this should be so.

至于为什么该这样，还没有人给出明确的答复。

《柯林斯英汉双解大词典》

We are of the opinion that great caution should be exercised in dealing with this matter.

我们认为处理这事应该非常谨慎。

《牛津词典》

Patients should be made aware of the risks involved with this treatment.

应该告诉病人这种治疗所涉及的风险。

《牛津词典》

"The question that should be put to Congress is how we can partner with this administration to reduce the rampant levels of corruption in Afghanistan."

VOA: standard.2009.10.21

And just to give you a sense, if you do a cross-cut of this, you cannot show it from this angle, but it should really be sort of a dumbbell shape with the nodal plane in between the two nuclei.

告诉你们这些就是给你们点概念，假如你们把他横切切开，不能从角度上展示，但它还是会保留几分哑铃的形态,以及在两核之间的节面。

麻省理工公开课 - 固态化学导论课程节选

Ordinary material objects of this world can partake of the various Platonic forms, but they should not be confused with the Platonic forms.

现实世界的普通物体,能够分有各种各样的型相,但不能把它们同型相混为一谈

耶鲁公开课 - 死亡课程节选

And my uncle brought me to see him, and I didn't have the kind of money that people had to invest, and my uncle said, I think you should be with this man because this man never loses, you know, any money.

NPR: Client Learns Madoff Returns Worthless

"More should be done with this role to promote the city and tourism, including trips abroad, " he said.

BBC: Sheriff dismisses 'villain' tag

The left argued, unsurprisingly enough, that the state-owned airport authority, not private companies, should be entrusted with this task.

ECONOMIST: Indian privatisation