Technical note: the medicine sent to Niger is artesunate + amodiaquine, one of four artemisinin-based combination therapies (ACTs) recommended by WHO.
技术说明：发运到尼日尔的药物系世卫组织建议的四种以青蒿素为基础的联合治疗药物之一：青蒿琥酯+阿莫地喹。
Note that even though we have four non-zero amplitudes, the sum of the squares of the absolute values of the amplitudes always adds up to one.
请注意即使我们有四个非0振幅，这些振幅绝对值的平方和总能达到1。
One important issue to note: When I tried the big-RDF-database approach to such a synonym-driven search four years ago, I had a lot of trouble with performance.
有一点要注意，四年前我尝试用大型 RDF 数据库进行这种同义词驱动的搜索时遇到了很多性能问题。
He writes down this four - to five-minute composition note for note in just one sitting.
他便一口气，逐个音符地，写下了这段四到五分钟的作品。
He writes down this four - to five-minute composition note for note in just one sitting.
他便一口气，逐个音符地，写下了这段四到五分钟的作品。
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