印刷顺序号的简称。
3号病房还有一张空床，把他送来，我会照顾他的。
We have one bed available in ward 3, send him here and I will take care of him.
2021年2月，天问一号探测器把第一张火星的照片送回了中国。
Tianwen I probe sent the first picture of Mars back to China in February, 2021.
39号公路沿线的铁丝网上挂着一张人们自制的海报，上面布满了心形图案，以感谢消防员和警察。
On a chain-link fence along Route 39 hangs a homemade poster, peppered with hearts, thanking firefighters and police.
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