練習(xí)材料：
[Day 1791 2019-08-22]
Lesson 35-2 Space odyssey
Because the gravity on the Moon's surface is only a sixth of Earth's (remember
how easily the Apollo astronauts bounded along), it takes much less energy to
accelerate to that 1.5 miles per second than it does on Earth. Moon-dwellers will be
able to fly in space at only three per cent of the cost of similar journeys by their
terrestrial cousins.
Arthur C. Clark once suggested a revolutionary idea passes through three phases:
1 'It's impossible -- don't waste my time.'
2 'It's possible, but not worth doing.'
3 'I said it was a good idea all along.'
任務(wù)配置：L0+L1+L4
知識筆記：
Moon-dwellers? 月球居民
terrestrial? ? adj. 陸地的; 陸棲的; 陸生的; 地球的; 地球上的; 陸地上的脐供，地面上的(與衛(wèi)星相對而言);? n. 地球人; 陸地生物;
練習(xí)感悟：
