Four X-reactive fluorescent dyes of 1, 8-naphthalimide were synthesized. Their spectrophotometric and dyeing properties were studied.

本文合成了四支x -型1,8萘酰亚胺类活性荧光染料，并对它们的光谱及染料性能进行了研究。

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John Singer Sargent's painting known as "Madame X" was disputed when it was shown in eighteen eighty-four.

VOA: special.2010.08.04

This is now on the heap it's four bytes so what gets stored in X?

在堆上，它是4个字节,那么在x中存储的是什么？

哈佛公开课 - 计算机科学课程节选

The first proposal for this new research vehicle, the X-15, was made in nineteen fifty-four.

VOA: special.2010.07.07

Caleb was a four-time X Games medalist attempting a move he has landed several times previously.

CNN: Snowmobiler Caleb Moore dies a week after crash

Caleb is a four-time X Games medalist who fell short on his rotation on a move he has landed several times previously.

CNN: STORY HIGHLIGHTS

He produced four albums for X, including another landmark album "Los Angeles, " and played off and on with the band for three decades.

NPR: Manzarek, Founding Member Of The Doors, Dies At 74