scientists have discovered a planet outside our solar system that might be habitable (适宜居住的).

和平、富足的加拿大被联合国评为世界上最适宜居住的国家之一


optimum  n. 最适宜 adj. 最适宜的
1. most favorable condition or greatest degree or amount possible under given circumstances
2. most desirable possible under a restriction expressed or implied;  例子  "an optimum return on capital";  相似  "optimal concentration of a drug"

名词用法:
·They break up into fragments which explode just a few kilometres above the ground - "the optimum altitude for maximum devastation", said Dr Genge.

形容词用法:
·The sensor-based system can also respond to drivers approaching curves at higher than optimum speed by flashing a faster pulse.

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