英语听力：探索发现 2013-03-10 猛玛象进城记 Mammoths to Manhattan—18
时间：2019-01-23 作者：英语课 分类：探索与发现2013年
英语课
This mass roosting takes place soon after the summer nesting season. It’s a chance for the birds to molt 1 before they fly south for the winter. As Vaux’s swift numbers reach a peak in mid 2 September, they attract attention from the locals. Coopers hawks 3 and peregrines pluck a meal from the tumbling mass of birds. In as little as 20 minutes, as many as 40,000 swifts pack into the chimney for the night.
While a Portland chimney has become a substitute for a tree, another roosting creature has chosen a road bridge in Austin, Texas as its cave. Visitors to Austin have to wait till evening for a glimpse of what lurks 4 within the bridge.
As the sun goes down, Mexican free-tailed bats begin a breath-taking commute 5 out of the city. This exodus 6 only takes place in summer. Free-tailed bats arrive in Texas for the spring, returning to Mexico for the winter. More than a million of them leave the city at dusk and head into surrounding countryside to feed on insects. The sky over Austin swarms 7 with these aerial commuters.
n.换毛，脱皮，换毛期
- The fourth time they molt,they change into pupae.换第四次皮时，它们蜕变成蛹。
- This veterinary product is very effective in preventing animal molt.这种兽药对于防治兽类掉毛很有效。
adj.中央的，中间的
- Our mid-term exam is pending.我们就要期中考试了。
- He switched over to teaching in mid-career.他在而立之年转入教学工作。
鹰( hawk的名词复数 )； 鹰派人物，主战派人物
- Two hawks were hover ing overhead. 两只鹰在头顶盘旋。
- Both hawks and doves have expanded their conditions for ending the war. 鹰派和鸽派都充分阐明了各自的停战条件。
n.潜在，潜伏；（lurk的复数形式）vi.潜伏，埋伏（lurk的第三人称单数形式）
- Behind his cool exterior lurks a reckless and frustrated person. 在冷酷的外表背后，他是一个鲁莽又不得志的人。 来自《简明英汉词典》
- Good fortune lies within Bad, Bad fortune lurks within good. 福兮祸所倚，祸兮福所伏。 来自互联网
vi.乘车上下班；vt.减(刑)；折合；n.上下班交通
- I spend much less time on my commute to work now.我现在工作的往返时间要节省好多。
- Most office workers commute from the suburbs.很多公司的职员都是从郊外来上班的。
v.大批离去，成群外出
- The medical system is facing collapse because of an exodus of doctors.由于医生大批离去，医疗系统面临崩溃。
- Man's great challenge at this moment is to prevent his exodus from this planet.人在当前所遇到的最大挑战，就是要防止人从这个星球上消失。