常見(jiàn)例句雙語(yǔ)例句Mercury – the solar system's innermost planet – is at its greatest eastern elongation today.水星——太陽(yáng)系最里面的行星—今天是東部最大的延伸。At greatest eastern elongation, Mercury swings farthest east of the sun, and briefly appears as an evening "star" after sunset.這是水星是最大程度的在太陽(yáng)東部的延伸，這是今晚日落后最簡(jiǎn)短的一次顯示。By the time it arrives at its greatest elongation, it will appear roughly half-illuminated and the amount of its surface illuminated by the Sun will continue to decrease in the days to come.在它到達(dá)最大距角（elongation）時(shí)，它將看上去大概為半明亮、被太陽(yáng)照明的部分將在持續(xù)日子里減少。bbs.chinadaily.com.cn 返回 greatest elongation