The reason lies in its gravity.
其原因在于月球的重力。
新概念英语第四册 Lesson 35 Space odyssey

📚 句中词汇解析

从本句中提取的重要词汇

gravity ['ɡrævəti] 词频3 词根: grav
n. 重力;万有引力，地心引力;重要性，严重性;严肃，庄重;
💡 grav重+ity名词后缀 → 庄重；地心吸力
"Newton's law of gravity"
牛顿万有引力定律
近义：ponderosity, seriousness, circumspection, gravitation, importance, severity 反义：skittishness, superficiality, trifling, triviality, lightness, flippancy
reason ['rizn] 词频1 词根: 思考
n. 理由;原因;理性;理智; vt.& vi. 推理，思考;争辩;辩论;向…解释;
💡 再（re）生一个（a）儿子(son)， 理由是第一个儿子夭折了
"The reason for the flood was that heavy rain."
水灾是那场大雨造成的.
近义：ratiocinate, think, conclude, deduce, deduct, motivation 反义：idiocy, applesauce, imbecility, inaccuracy, inanity, mistake
lies
v. 躺卧（lie的第三人称单数形式）
近义：skulduggery, chicanery

📚 更多「新概念英语第四册」例句

The force there assembled was trivial compared with the Danish horde.
他集结在那里的军队和丹麦大军相比是微不足道的，
and of offering to the tenants offices and apartments that please them.
和向租房人提供使他满意的办公室和住房。
some drifting and slow, others jerky and rapid.
这些活动有的飘忽而缓慢，有的急剧而快速。
Many strange new means of transport have been developed in our century,
本世纪已研制出许多新奇的交通工具，
and is still non-existent in a number of 'civilized' nations.
今天，在许多文明国家里，义务教育迄今尚未实行。
however lucky and robust we are.
不管我们多么幸运，多么健壮，