so that, with very little effort, the birds can soar over the city. 游隼不费吹灰之力便可以在城市上空翱翔

70. Winds striking the sides of the skyscrapers
    风被摩天大楼阻挡后会向上偏转
71. are deflected upwards and can help the birds gain height.
    有利于游隼飞得更高
72. And the great areas of concrete roasting in the sun create thermals,
    烈日下大面积的混凝土散发的热量形成上升热气流
73. so that, with very little effort, the birds can soar over the city.
    游隼不费吹灰之力便可以在城市上空翱翔
74. And so many peregrines can live here,
    不计其数的游隼定居于此
75. because down at street level, there is a lot of potential prey.
    是因为城市近地面生活着许多猎物
76. Diving from height, the falcons can reach speeds
    游隼俯冲时的飞行时速

来自《行星地球 第二季 第六集 Planet Earth S02E06 城市》第 73 行