n.汞，水银

Mercury has a much greater density than air.
水银的密度比空气大得多。
Mercury is a unique metal.
水银是一种特殊金属。
Eric has no mercury in him.
埃里克没有精神。
Mercury is the smallest planet in our solar system.
水星是太阳系中最小的行星。
It's named after the Roman god of commerce and messenger, Hermes.
它的名字来源于罗马商业和信使之神赫耳墨斯。
Mercury has an extremely elliptical orbit around the sun.
水星的轨道非常椭圆，围绕太阳运行。
Due to its proximity to the sun, it experiences extreme temperature fluctuations.
由于靠近太阳，水星的温度变化极大。
The planet completes one orbit around the sun in just 88 Earth days.
水星绕太阳一周只需88个地球日。
Its thin atmosphere mainly consists of hydrogen and helium, with traces of other gases.
水星的大气层非常稀薄，主要由氢和氦组成，还有少量其他气体。
Mercury's surface is heavily cratered, giving it a "moon-like" appearance.
水星的表面布满了陨石坑，看起来像月球一样。
The planet has no natural satellites, making it unique among the terrestrial planets.
水星没有天然卫星，这是它在类地行星中独一无二的特征。
It's known for its retrograde motion, where it appears to move backward in the sky occasionally.
水星以其逆行运动而闻名，有时在天空中看似倒退。
Astronomers have sent several spacecraft to study Mercury, such as NASA's MESSENGER mission.
天文学家已经向水星发射了多个探测器，如NASA的"信使"号任务，以研究其特性。