The prime example is the element uranium (U), which occurs naturally as two isotopes-the lighter, fissionable U-235 and the heavier, non-fissionable U-238.

铀（U）元素就是一个很好的例子。 天然铀有两种同位素； 较轻的负235可以裂变，较重的铀238则不会裂变。

youdao

All tax returns filed by the Company and its subsidiaries for the past five years with any U. S. or non-U. S. taxing authorities and copies of any correspondence related thereto.

过去五年公司及其子公司从国家税务机构所得到所有退税纪录，以及所有通信纪录复印件。

youdao

Rasmussen noted that all 28 NATO members are taking part in the mission and that non-U.S.troop commitments have risen by 9,000 in 18 months.

VOA: standard.2009.09.29

The report based on information from U.S.embassies, international organizations and non-governmental groups assessed 175 countries and gave 17 of them the lowest possible rating for anti-trafficking efforts.

VOA: standard.2009.06.16

The Obama administration has already promised to double the non-military U.S.foreign aid budget to $50 billion a year by 2012 and Clinton's speech offered no new commitments.

VOA: standard.2010.01.06

Ross insisted that he did not endorse the U and non-U rules.

NEWYORKER: The English Wars

Therefore, both U.S. and non-U.S. public companies will continue to borrow money to buy their own shares.

FORBES: Three Bulls Walk Into A Forbes Cruise

Earlier this week, he told his subscribers that he sold part of his gold position as the charts of the yellow metal in U.S. dollar and non-U.S. dollar terms were turning modestly bearish.

FORBES: INTERVIEW: Market Psychology Is Shifting -- Gartman