新概念英语第四册句子解析Lesson30:海底勘探

2022-08-16 07:30:00来源:网络

新概念英语第四册句子解析Lesson30:海底勘探

  新概念英语第四册需要大家掌握的内容比较多,所以大家在学习这部分知识的时候,需要投入更多的时间和精力。那么具体的新概念英语第四册的都有哪些知识点,为了节省大家的时间,更全面的集中攻克本册的难点,下面小编为大家整理了“新概念英语第四册句子解析Lesson30:海底勘探”,希望对大家的学习有更好的帮助。

  课文30 海底勘探

  542. Our knowledge of the oceans a hundred yearsago was confined to the

  two-dimensional shape ofthe sea surface and the hazards of navigationpresented

  by the irregularities in depth of theshallow water close to the land.

  100年前,我们只知道海洋是二维平面形的,以及靠近陆地浅水区的深浅不一能给航行带来危险。

  543. The open sea was deep and mysterious, andanyone who gave more than a

  passing thought tothe bottom confines of the oceans probably assumed that the

  sea bad was flat.

  无边无际的海洋深邃而又神秘,凡是稍稍想过大海海底的人大概都会认为海底是平坦的。

  544. Sir James Clark Ross had obtained a sounding of over 2,400 fathoms in

  1839, but it wasnot until of deep soundings was obtained in the Atlantic and the

  first samples were collected bydredging the bottom.

  1839年,詹姆斯.克拉克.罗斯爵士曾测得海水深度超过2,400英寻;但直到1869年,皇家学会用英国“豪猪”号舰艇进行了几次巡航后,才在大西洋测得一个海水深度,同时能过挖掘海底,取得了研究海底的首批样品。

  545. Shortly after this the famous H. M. S. Challenger expedition

  established the study of thesea-floor as a subject worthy of the most qualified

  physicists and geologists.

  此后不久,英国著名的“挑战者”号舰艇对海底的那次考察,把对海床的研究确立为一个值得一流物理学家和地质学家从事的研究课题,

  546. A burst of activity associated with the laying of submarine cables

  soon confirmed thechallenger's observation that many parts of the ocean were two

  to there miles deep,

  铺设海底电缆的热潮很快证实了“挑战者”号的观察结果:海洋中很多地方可深达两三英里,

  547. and the existence of underwater features of considerable

  magnitude.

  水下特征差异极大。

  548. Today, enough soundings are available to enable a relief map of the

  Atlantic to be drawnand we know something of the great variety of the sea bed's

  topography.

  现在已有足够的水深测量数据来绘制一张大西洋洋底地形图,而且我对海底地形的千变万化也有了一定的了解。

  549. Since the sea covers the greater part of the earth's surface,

  既然海洋覆盖着地球的大部分表面,

  550. it is quite reasonable to regard the sea floor as the basic form of

  the crust of the earth,with, superimposed upon, it the continents, together with

  the islands and other features of theoceans.

  因此完全有理由把海床看作地壳的基本模壳,上面附加着大陆以及岛屿和海洋的其他形态。

  551. The continents form rugged tablelands which stand nearly three miles

  above the floor ofthe open ocean.

  大陆是崎岖不平的高地,高出辽阔的海洋海底近三英里。

  552. From the shore line, out a distance which may be anywhere from a few

  miles to a fewhundred miles, runs the gentle slope of the continental shelf,

  geologically part of thecontinents.

  从海岸线向大海延伸几英里到几百英里的区域是大陆架慢坡,从地质学上来说,它是大陆的一部分。

  553. The real dividing line between continents and oceans occurs at the

  foot a steeper slope.

  大陆和海洋的真正分界线是在陡破脚下。

  554. This continental slope usually starts at a place somewhere near the

  100-fatheom markand in the course of a few hundred miles reaches the true ocean

  floor at 2,500-3,500 fathoms.

  大陆架慢坡一般是从差不多100英寻水深的地方开始的,一直延伸到几百英里远深达2,500至3,500的地方,那里才是真正的海底。

  555. The slope averages about 1 in 30.

  坡度平均约为1/30,

  556. but contains steep, probably vertical, cliffs, and gentle

  sediment-covered terraces,

  但其中包括陡峭的、乃至垂直的峭壁和沉积物覆盖的缓和的阶梯地带,

  557. and near its lower reaches there is a long tailing-off which is almost

  certainly the result ofmaterial transported out to deep water after being eroded

  from the continental masses.

  在这个地带的低处是很长的一段尾沙地段,基本上可以断定这个地段是大陆块体上侵蚀下来的物质被水冲到深水处形成的。

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