Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop.
反之，如果恒星很小，维持生命的行星就要在离恒星很近的轨道上运行，而且要有极好的条件才能使生命得以发展，
新概念英语第三册
Lesson 55 From the earth Greetings
📚 句中词汇解析
从本句中提取的重要词汇
n. [天]行星;[占星]（左右人命运的）星相;
💡 plano-, plan-, -plany, -plania 表”被动的漂流,闲逛”
"the planet Earth"
地球这颗行星
近义：planetary
adj. 紧密的;亲密的;亲近的;
vt. 关;结束;使靠近;
vi. 关;结束;关闭;
adv. 紧密地;
n. 结束;
💡 clud(shut)→关闭；结束；接近的；亲近的；准确的
"a close ally and friend of the prime minister"
首相的一个亲密盟友和伙伴
近义：lock, seal, shut, quadrate, tally, solemnize
反义：unclose, unlatch, unlock, unseal, unfold, induct
orbit
['ɔrbɪt]
词频3
词根: orb
n. 轨道;势力范围;眼眶;（人生的）旅程，生活过程;
vt.& vi. 在…轨道上运行，环绕轨道运行;
vi. 盘旋;绕轨道运行;
vt. 绕轨道而行;进入轨道;
💡 orb圆圈+it表名词→轨道
"the earth's orbit around the sun"
地球环绕太阳的轨道
近义：loop, circle, cycle
反义：pass, range, span, traverse, bridge, course
vt.& vi. 提供，供给，供应;
vt. 规定;提供(+for);装备;预备;
vi. 抚养，赡养(+for);做准备;预约(for 或 against);
💡 pro提前+vid看+e→提前看好→预备；提供
"We flatter ourselves that we provide the best service in town."
我们相信我们提供的服务在本市最好.
近义：minister, procure, provision, purvey, stock, supply
adj. 完美的;正确的;优秀的;极好的;
n. [语]完成时;
💡 per全部+fect做→全部做完→完美的；完全的
"Everyone liked my father—he was the perfect gentleman."
大家都喜欢我父亲—他是真正的君子。
近义：improve, purify, refine, upgrade, better, meliorate
反义：incomplete, bad, sketchy, unaccomplished, uncompleted, unfinished