The results of 15N tracing showed that the fertilizer-N uptake in rice plant and grain of two varieties increased with the advance of growth stage.

示踪结果显示，两个品种水稻植株和籽粒吸收肥料氮，都随着生育期的推移而逐渐增加。

youdao

Mr.Obama spoke in advance of meeting at the U.N. late Wednesday of foreign ministers of the five permanent U.N.Security Council member countries and Germany - the P5+1, who have been trying to re-engage Iran in negotiations on its nuclear program.

VOA: standard.2009.09.23

Founded in 1945 in San Francisco, the U.N. was once a magnificent opportunity to advance freedom in the world.

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Formed during the advance north by U.N. troops in 1950, they proved their mettle the following year after resurgent communist armies swept south.

CNN: THE UNKNOWN SOLDIERS

An advance team of U.N. observers is in Syria to check compliance with the cease-fire, with 30 unarmed monitors expected in the coming days.

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