Basal metabolism is much lower for creatures in cold water.冷水中生物的基础代谢速度要低很多。Regular exercise can increase your basal metabolic rate.定期运动能够提高你的基础代谢率。basal cells of the skin皮肤基底细胞...
早期的天文学家认为我们的星球是宇宙的中心。Early astronomers thought that our planet was the centre of the universe.人类对于宇宙的了解已经大为增加。Mankind's knowledge of the universe has increased beyond measure.载人宇宙飞行的前景看上去充满了越来越多的变数。The future for ma...