因为这不是完整的话。局长的意思是他们不知道背面有什么，去那里的好处没有去极地多。
所以always in dark 是对应“we dont know whats on the back”，所以是看不见的意思。
下面是专业论文和科普文章里，dark side 的用法，有背面的意思，也有黑暗的意思。
Scientists watch dark side of the moon to monitor earth's climate (AGU 2001)
Astronomers Find Life on Earth - "...by studying Earthshine-the light of the Earth reflected off the dark side of the Moon" (Harvard/CfA 2002)
Lunar Prospecting With NASA's Chandra X-Ray Observatory - "the so-called dark Moon X-rays do not come from the dark side of the Moon," (Chandra 2003)
Chandra Observations of the "Dark" Moon and Geocoronal Solar-Wind Charge Transfer (Chandra 2004)
Earth's reflectivity a great unknown in gauging climate change impacts - "...astronomers who monitored "Earthshine" on the dark side of the moon" (UW 2005)
New high-res map suggests little water inside moon - "...on the dark side of the moon as well as the near side" (OSU 2009)
Richard Branson Launches Virgin Oceanic - "...It's like being on the dark side of the moon." (Virgin Oceanic 2011)
Kepler Telescope star data creates musical melody
- "Why stop at the dark side of the moon to make music..." (Georgia Tech 2012)
Researchers Propose Using Distant Quasars to Test Bell's Theorem - "...or 1,000-meter telescopes on the dark side of the Moon" (MIT 2014)


【 在 ia 的大作中提到: 】
: 来做点英文阅读理解
: “They are going to have a lander on the far side of the moon, which is the side which is always in dark. Uh, we’re not planning to go there,” he said.
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