Tooth brushing became popular during the World War I.

第一次世界大战期间，刷牙开始流行起来。

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After staying overnight in London, we travel on Day 2 to Northern France to visit the World War I battlefields.

在伦敦过夜后，第二天我们前往法国北部，参观一战战场。

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World War I left an indelible imprint on the twentieth-century world.

第一次世界大战给20世纪的世界留下了深远的影响。

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The project collects remembrances of veterans who served in World War I,World War II, the Korean War and Vietnam War.

VOA: special.2010.11.05

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。

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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

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Eddie Rickenbacker, the World War I ace, bravely founded Eastern Airlines in the late 1930s.

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The World War I Allies said they would enforce the Versailles Treaty on demilitarizing the Rhineland.

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Poppy seeds are being sown around a rural Cambridgeshire railway station in time for the World War I centenary.

BBC: WWI poppy planting begins at Shepreth station