【英语时差8，16】在企鹅蛋壳上行走
时间：2019-02-23 作者：英语课 分类：英语时差8，16
英语课
Walking on penguin 1 eggshells on this Moment of Science. Yael: Today, we're talking penguin eggs.
Don: Why?
Y: Penguins 2 lay their eggs on hard surfaces near coastlines, or they might dig burrows 3 if the soil permits. And because they're optimized 4 for swimming rather than walking, it's difficult for penguins to gather a lot of soft nesting material. See the problem?
D: Hmm! the penguin lifestyle isn't exactly eggshell-friendly.
Y: And that's not counting the nasty fights penguins can get into over things like space for their nests or burrows, and the stones that some species pile up around their nests if they're in the open.
D: I bet all that hubbub 5 isn't very good for eggs either. So do penguins lose more eggs than other species?
Y: Actually, according to one study, only 2.6 percent of penguin eggs break from causes other than human interference or predators 6. That rate is similar to the rate in the rest of the bird world, even including those birds that have cushy nests and never fight near their eggs.
D: So how do they do it? By producing thicker shells?
Y: Yep. Penguin eggshells are fifty percent thicker than expected for their size. But it isn't easy to produce thick egg shells. It requires a lot of calcium 7, more than female penguins normally get in their diets.
D: And they can't just run to the store for a supplement.
Y: Nope. So in the period right before they lay eggs, female penguins eat a lot of mollusks. The clam 8 and mussel shells in their stomachs slowly leach 9 calcium which is then used to form eggshells. Incidentally, thicker shells also help prevent breakage for birds that lay eggs on rocks, and for ostriches 10 and rheas.
D: I always did wonder about those ostriches.
n.企鹅
- The penguin is a flightless bird.企鹅是一种不会飞的鸟。
- He walked with an awkward gait like a penguin.他走路的步子难看得就像企鹅。
n.企鹅( penguin的名词复数 )
- Why can penguins live in cold environment? 为什么企鹅能生活在寒冷的环境中？ 来自《简明英汉词典》
- Whales, seals, penguins, and turtles have flippers. 鲸、海豹，企鹅和海龟均有鳍形肢。 来自《现代英汉综合大词典》
n.地洞( burrow的名词复数 )v.挖掘（洞穴），挖洞( burrow的第三人称单数 )；翻寻
- The intertidal beach unit contains some organism burrows. 潮间海滩单元含有一些生物潜穴。 来自辞典例句
- A mole burrows its way through the ground. 鼹鼠会在地下钻洞前进。 来自辞典例句
adj.最佳化的，（使）最优化的v.使最优化，使尽可能有效( optimize的过去式和过去分词 )
- We are often asked whether consumer Web sites should be optimized for beginners or intermediates. 我们常常被问到这样的问题：消费类网站究竟应该为新手而优化，还是应该为中间用户而优化？ 来自About Face 3交互设计精髓
- GOOGLE Advertising optimized sequence, greatly increasing the advertising effect. 优化了GOOGLE广告位排列顺序，大大增加了广告效果。 来自互联网
n.嘈杂；骚乱
- The hubbub of voices drowned out the host's voice.嘈杂的声音淹没了主人的声音。
- He concentrated on the work in hand,and the hubbub outside the room simply flowed over him.他埋头于手头的工作，室外的吵闹声他简直象没有听见一般。
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）
- 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》
n.钙(化学符号Ca)
- We need calcium to make bones.我们需要钙来壮骨。
- Calcium is found most abundantly in milk.奶含钙最丰富。
n.蛤，蛤肉
- Yup!I also like clam soup and sea cucumbers.对呀！我还喜欢蛤仔汤和海参。
- The barnacle and the clam are two examples of filter feeders.藤壶和蛤类是滤过觅食者的两种例子。
v.分离，过滤掉；n.过滤；过滤器
- Liquid water can leach soluble materials from the interface.液态水能够从界面溶解出可溶性物质。
- They believe that the humic materials are leached from decaying plant materials.他们认为腐植物料是从腐烂的植物体浸沥而来。