【英语时差8,16】恐鸟灭绝后，枪木的进化

Lancewoods And Moas Long Gone Like animals, plants evolve by adapting to their surroundings. For example, New Zealand’s lancewood tree has evolved to defend itself against being eaten by the moa–a large, flightless bird related to the emu and ostrich¹. Scientists speculate that as a tiny seedling², the lancewood grows small brown leaves that help the infant tree blend in with leaf litter on the forest floor. So a prowling moa might pass by and spare the plant. As it grows, the lancewood’s leaves change, becoming long and spiky³, with barbs⁴ along the edges. Scientists believe that bright spots near the barbs are probably meant to get moas’ attention and make them think twice about trying to swallow such a prickly meal. Finally, when they reach adulthood⁵, the lancewood’s leaves change once again, becoming rounder and losing their spikes⁶. Why? Perhaps because the tree is now tall enough to hoist⁷ its leaves out of the reach of hungry moas. Now, what’s especially interesting about all this is that while the lancewood tree still thrives in New Zealand, moas were hunted to extinction⁸ around five-hundred years ago. But the trees they once dined upon still go about their business as though the birds were still a threat. So what is this mean? First, that scientists can really only speculate about why the lancewood behaves the way it does. But it also suggests that to really understand a plant’s evolution, we have to consider not only its current environment but also its past. Defenses evolved against now-extinct predators⁹ may still shape a plant’s appearance and behavior today.

1 ostrich   

n.鸵鸟

参考例句：

• Ostrich is the fastest animal on two legs.驼鸟是双腿跑得最快的动物。
• The ostrich indeed inhabits continents.鸵鸟确实是生活在大陆上的。

2 seedling   

n.秧苗，树苗

参考例句：

• She cut down the seedling with one chop.她一刀就把小苗砍倒了。
• The seedling are coming up full and green.苗长得茁壮碧绿。

3 spiky   

adj.长而尖的，大钉似的

参考例句：

• Your hairbrush is too spiky for me.你的发刷，我觉得太尖了。
• The spiky handwriting on the airmail envelope from London was obviously hers.发自伦敦的航空信封上的尖长字迹分明是她的。

4 barbs   

n.（箭头、鱼钩等的）倒钩( barb的名词复数 )；带刺的话；毕露的锋芒；钩状毛

参考例句：

• She slung barbs at me. 她说了些讥刺我的话。 来自《简明英汉词典》
• I would no longer uncomplainingly accept their barbs or allow their unaccountable power to go unchallenged. 我不会再毫无怨言地洗耳恭听他们带刺的话，或让他们的不负责任的权力不受到挑战。 来自辞典例句

5 adulthood   

n.成年，成人期

参考例句：

• Some infantile actions survive into adulthood.某些婴儿期的行为一直保持到成年期。
• Few people nowadays are able to maintain friendships into adulthood.如今很少有人能将友谊维持到成年。

6 spikes   

n.穗( spike的名词复数 )；跑鞋；（防滑）鞋钉；尖状物v.加烈酒于( spike的第三人称单数 )；偷偷地给某人的饮料加入（更多）酒精（ 或药物）；把尖状物钉入；打乱某人的计划

参考例句：

• a row of iron spikes on a wall 墙头的一排尖铁
• There is a row of spikes on top of the prison wall to prevent the prisoners escaping. 监狱墙头装有一排尖钉，以防犯人逃跑。 来自《简明英汉词典》

7 hoist   

n.升高，起重机，推动；v.升起，升高，举起

参考例句：

• By using a hoist the movers were able to sling the piano to the third floor.搬运工人用吊车才把钢琴吊到3楼。
• Hoist the Chinese flag on the flagpole,please!请在旗杆上升起中国国旗！

8 extinction   

n.熄灭，消亡，消灭，灭绝，绝种

参考例句：

• The plant is now in danger of extinction.这种植物现在有绝种的危险。
• The island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。

9 predators   

n.食肉动物( predator的名词复数 )；奴役他人者（尤指在财务或性关系方面）

参考例句：

• birds and their earthbound predators 鸟和地面上捕食它们的动物
• The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》