I'm Steve Ember. Germany's attack on Poland and the start of World War Two in Europe presented a problem for Americans in September of nineteen-thirty-nine.

VOA: special.2011.05.12

And Born worked on a number of things, including the Born exponent, and taught himself crystallography sort of as something to do during World War I.

玻恩也做出了许多贡献，包括玻恩指数，他自学结晶学,这大约是在一战期间。

麻省理工公开课 - 固态化学导论课程节选

If you go onto the continent,though, they tended to be interrupted by World War I and World War II.

如果你们往欧洲大陆国家那里考虑,一战和二战期间的数据几乎是没有存档的

耶鲁公开课 - 金融市场课程节选

Historians agree Armenians were massacred by the Ottoman Empire - what was to become Turkey - during World War I.

VOA: standard.2010.03.18

An estimated 80,000 people died in the fighting, many in World War I-style trench warfare.

VOA: standard.2009.08.20

During World War I, the federal government nationalized all the express companies.

VOA: standard.2010.03.11

(Choral Music) At London's Westminster Abbey, the Queen,Prime Minister and military leaders attended a remembrance service, the first one without a British World War I veteran in attendance.

VOA: standard.2009.11.11

A majority of scholars and historians agree that the massacre of an estimated one million Armenians during World War I constitutes genocide as defined by the 1948 United Nations Convention on Genocide.

VOA: standard.2010.03.19

"In terms of foreign policy where Iran comes in, all three parties are following the same interventionist policies which gave us the Iraq war, the wars in Afghanistan and elsewhere in the world and I think on that even the Liberal Democrats - despite being perceived as softer - they're following the same underlying policies.

VOA: standard.2010.04.30