observing mercury
观察水星
以上为机器翻译结果，长、整句建议使用 人工翻译 。
He also writes an observing column and creates star maps for the Astronomical Society of the Pacific's Mercury magazine.
他还写一个观测列，创造了太平洋的水星杂志天文学会星图。
youdao
He began a program of observing not only Mars, but also Venus and Mercury.
VOA: special.2010.07.11
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