navigation [ˌnæviˈɡeiʃən] n. 航海
【扩】sailing 航海
sounding [ˈsaundiŋ] n. 水深度
porcupine [ˈpɔːkjupain] n. 箭猪
dredge [dredʒ] v. 挖掘
【搭】dredge sth. up 旧事重提
expedition [ˌekspiˈdiʃən] n. 远征
physicist [ˈfizisist] n. 物理学家
magnitude [ˈmæɡnitjuːd] n. 很多
topography [təˈpɔɡrəfi] n. 地形
crust [krʌst] n. 地壳
【派】crustal 外壳的
【扩】earth shell 地壳
【搭】earn ong's crust 谋生
rugged [ˈrʌɡid] adj. 崎岖不平的
tableland [ˈteibəl-lænd] n. 高地
【构】table（桌子）＋land（地）＝tableland（高地）
【扩】upland 高地，山地 highland 高地，山地
sediment [ˈsedimənt] n. 沉淀物
【扩】precipitate 沉淀物
* * *
A: Oh, there is some sediment in the bottom of the bottle.
B: Don't worry. It's pulp.
A：哦，瓶子底部有一些沉淀物。
B：别担心，那是果肉。
* * *
terrace [ˈterəs] n. 阶地
erode [iˈrəud] v. 侵蚀
noun [抽象名词]导航；航行，航海；航运，水上运输；浏览，访问；领航术，航海术；内河水道（尤指运河） - Pack ice around Iceland was becoming a threat to navigation.
noun [抽象名词]水深测量；测得的水深；意见调查，调查结果（常复数）；（铃或号的）发声 - There were 15 minutes between the first air raid alert and the sounding of the all-clear signal.
adjective [原级]发出声响的；虚夸空洞的，冠冕堂皇的；回响的，回荡的 - He needed a sounding board rather than thinking alone.
noun [抽象名词]英寻（测量水深单位，合6英尺或1.8米） - A fathom is a measurement of 6 feet or 1.8 metres, used when referring to the depth of water.
verb [vt. 及物动词]深刻理解，彻底弄清（难题或神秘的人）；测量（水）的深度 - I really couldn't fathom what Steiner was talking about.
noun [专属名词][脊椎]箭猪，豪猪 - My best friends are the woodchuck, the porcupine and the raccoon.
noun [专属名词]（Porcupine）人名；（英）波库派恩 - In Maine, the most commonly counted roadkill species is the North American porcupine.
verb [vt. 及物动词]vt. （用挖泥船等）疏浚；（用拖捞网等）捞取；（在食物上）撒（面粉等） - They dredge the bay for gravel.
verb [vi. 不及物动词]vi. 疏浚，挖掘；采捞 - Police have spent weeks dredging the lake but have not found his body.
noun [专属名词]挖泥船，疏浚机；拖捞网 - It is called dredge.
noun [专属名词]远征，考察；探险队，考察队；动作敏捷，迅速 - It won't be labelled in any way as a military expedition.
noun [专属名词]物理学家 - He's known to be an outstanding physicist.
noun [专属名词]巨大，重要性；震级；规模，大小；数量，数值；（恒星的）亮度，星等 - An operation of this magnitude is going to be difficult.
noun [专属名词]地形学，地形测量学 ；地形，地貌；地图地形描绘；（剖，生）局部解剖（图） - The topography of the river's basin has changed significantly since the floods.
noun [专属名词]面包皮；（馅饼或比萨饼等的）酥皮；硬外皮，硬外壳；地壳；<非正式>生活，生计 - Cut the crusts off the bread and soak the bread in the milk.
verb [vt. 及物动词]形成（或结成）硬皮（或硬壳） - Bake until the crust is golden.
adjective [原级]（地面，地形）高低不平的，崎岖的；（男人的外貌）粗犷而英俊的；强健而坚毅的；（机器或其他制造品）坚固耐用的；艰难的，严峻的 - The enemy would always have the advantage of familiarity with the rugged terrain.
noun [专属名词]高原；台地 - Night slowly reached the tableland.
noun [物质名词]沉淀物，沉渣；（最终形成岩石层的沙、石等）沉积物 - Many organisms that die in the sea are soon buried by sediment.
verb [vt. 及物动词]（液体）沉淀；沉积 - They found a unique layer of sediment worldwide.
noun [专属名词]（风格相同、互相连接的）排屋；（尤指房屋或餐馆外的）露天平台，阳台；<英>（足球场的）阶梯看台；梯田，阶地；<英>排屋中的一栋房屋；（地质）沿岸阶地，阶面 - Some guests recline in deck chairs on the sea-facing terrace.
verb [vt. 及物动词]使成阶地（或梯田） - ...massive terraces of corn and millet carved into the mountainside like giant steps. …
verb [vt. 及物动词]侵蚀，腐蚀；削弱，降低 - Then over many more years, the Phosphorus-rich rocks of the new land begin to erode and the cycle continues.
