解释：大部分鸟类都是雄性的，而雌鸽却是雌性的，说明了鸟类性别的特殊性。
Legal systems are not static; they evolve over time in response to social changes.
I prefer liberty with danger to peace with slavery.
Collaboration across industries is key to solving the complex problems facing modern farming.
数学中最深刻的洞见往往来自意想不到的类比。
没有内心生活的人是他周围环境的奴隶。