【英语时差8,16】蚯蚓（上）

 Charles Darwin is best known for his studies of evolution by means of natural and sexual selection, but did you know he was also a pioneer in the study of earthworms? After watching an earthworm s-l-o-w-l-y drag a leaf into its burrow¹, Darwin became fascinated by these unassuming creatures. He began an exhaustive study of worm behavior, sensory² abilities and digestion³. His book on worms was the first to describe the enormous impact of earthworms on our lives. Darwin noticed that a thick layer of charcoal⁴ and cinders⁵ that he’d spread across a large field two years earlier was now uniformly covered by several inches of earth. He surmised⁶ that what appeared to be the “sinking” of the charcoal layer was actually the result of earthworm “castings.” Earthworms swallow soil, extract nutrients⁷ from it, then excrete the rest up onto the surface. These excretions—small dark mounds⁸ of fine dirt you may see dotting the ground—are called castings.

1 burrow   

vt.挖掘(洞穴)；钻进；vi.挖洞；翻寻；n.地洞

参考例句：

• Earthworms burrow deep into the subsoil.蚯蚓深深地钻进底土。
• The dog had chased a rabbit into its burrow.狗把兔子追进了洞穴。

2 sensory   

adj.知觉的，感觉的，知觉器官的

参考例句：

• Human powers of sensory discrimination are limited.人类感官分辨能力有限。
• The sensory system may undergo long-term adaptation in alien environments.感觉系统对陌生的环境可能经过长时期才能适应。

3 digestion   

n.消化，吸收

参考例句：

• This kind of tea acts as an aid to digestion.这种茶可助消化。
• This food is easy of digestion.这食物容易消化。

4 charcoal   

n.炭，木炭，生物炭

参考例句：

• We need to get some more charcoal for the barbecue.我们烧烤需要更多的碳。
• Charcoal is used to filter water.木炭是用来过滤水的。

5 cinders   

n.煤渣( cinder的名词复数 )；炭渣；煤渣路；煤渣跑道

参考例句：

• This material is variously termed ash, clinker, cinders or slag. 这种材料有不同的名称，如灰、炉渣、煤渣或矿渣。 来自《简明英汉词典》
• Rake out the cinders before you start a new fire. 在重新点火前先把煤渣耙出来。 来自《简明英汉词典》

6 surmised   

v.臆测，推断( surmise的过去式和过去分词 )；揣测；猜想

参考例句：

• From the looks on their faces, I surmised that they had had an argument. 看他们的脸色，我猜想他们之间发生了争执。
• From his letter I surmised that he was unhappy. 我从他的信中推测他并不快乐。 来自《简明英汉词典》

7 nutrients   

n.（食品或化学品）营养物，营养品( nutrient的名词复数 )

参考例句：

• a lack of essential nutrients 基本营养的缺乏
• Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》

8 mounds   

土堆，土丘( mound的名词复数 )； 一大堆

参考例句：

• We had mounds of tasteless rice. 我们有成堆成堆的淡而无味的米饭。
• Ah! and there's the cemetery' - cemetery, he must have meant. 'You see the mounds? 啊，这就是同墓，”——我想他要说的一定是公墓，“看到那些土墩了吗？