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These alone took sixteen months to build.
=It took the workers sixteen months to build the platforms.
Above the surface of the water, the towers rise to a height of nearly 700 feet.
extend to a depth of… 伸展的深度
extend to a length of… 伸展的长度
extend to a width of… 伸展的宽度 (width n.宽度, 宽广 )
rise to a height of… 伸展的高度
They support the cables from which the bridge has been suspended.
which 指代先行词 cables
Each of the four cables contains 26,108 lengths of wire.
It has been estimated that if the bridge were packed with cars, it would still only be carrying a
third of its total capacity.
It has been estimated that...(It is said that… It is reported that…)
It has been estimated, It has been expected
were 虚拟语气(桥上不可能摆满汽车)
carry v.承载
a third of… …的 1/3
However, size and strength are not the only important things about this bridge.
Despite its immensity, it is both simple and elegant, fulfilling its designer's dream to
create'an enormous object drawn as faintly as possible'.
Immensity 指代 size
Despite=in spite of
Fulfill vt.履行, 实现, 完成(计划等)
Fulfilling 分词做状语表示结果
-- The bus was held up by the snowstorm, causing the delay.(hold up 阻挡, 拦截)
-- Her husband died in 1970, leaving her with her children.
-- At last he passed his examination, fulfilling his dream to go abroad.