rst of applause:  一阵喝彩

associate with 与……有联系

 

A burst of activity associated with the laying of submarine cables soon confirmed the Challenger's observation that many parts of the ocean were two to three miles deep, and the existence of underwater features of considerable magnitude.

并列结构

结构上对称

内容上相关

有明显的连词或标点符号标记

通常伴随省略结构

常用并列结构：

as…as

as well as

and

or

 

not… but…

It is not… it is…

either or

whether…or

than 的比较

less… more…

rather than…

there is… than there is…

partly… partly…

some… others…

 

Today, enough soundings are available to enable a relief map of the Atlantic to be drawn and we know something of the great variety of the sea bed's topography.

enable … to do

relief 减轻，缓解，浮雕

relief map 地形图，立体地图

topography 地形

 

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

书中的标点符号错误 superimposed upon it

regard … as 把……认为是

see… as

consider… as

view…as

 

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

superimpose on (upon)：place sth on top of sth else, force acceptance of an idea in addition to…

The conquerors tried to superimpose their way of life on the customs of the town, but did not succeed.

There is a map of China superimposed on the book.

 

The continents form rugged tablelands which stand nearly three miles above the floor of the open ocean.

rug 小的毯子，垫子

rugged 崎岖不平的，粗糙的, 有皱纹的

rag 抹布，破旧衣服

ragged 破旧的，不完整的

 

From the shore line, out to a distance which may be anywhere from a few miles to a few hundred miles, runs the gentle slope of the continental shelf, geologically part of the continents.

continental shelf 大陆架

 

The real dividing line between continents and oceans occurs at the foot of a steeper slope.

This continental slope usually starts at a place somewhere near the 100-fathom mark and in the course of a few hundred miles reaches the true ocean floor at 2,500-3,500 fathoms.

in the course of在...期间,在……过程中

 

The slope averages about 1 in 30, but contains steep, probably vertical, cliffs, and gentle sediment-covered terraces, and near its lower reaches there is a long tailing-off which is almost certainly the result of material transported out to deep water after be

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