我们了解到，张华和其他工作人员所有的加班都是完全自愿的，没有任何的酬劳。
We learned that Zhang Hua and her workers do all their overtime work on a volunteer basis - they receive no pay at all.
这张华丽的合成图像中，超新爆发的散乱碎片N49照亮了星空，数据基于钱德拉和哈勃太空望远镜。
Scattered debris from supernova explosion N49 lights up the sky in this gorgeous composited image based on data from the Chandra and Hubble Space Telescopes.
我听说你和张华是同学，请问你多大了？
I hear you are Zhang Hua's classmate. How old are you, please?
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