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5，The bridge is so long that the shape of the earth had to be taken into account by its designer.
take sth. into account / take sth. into consideration / take account of sth. 考虑到
e.g. We have to take the date into account when we have the meeting.
6, Two great towers support four huge cables.
support : hold up 支撑
7, The platforms extend to a depth of over 100 feet under the sea.
feet 这里是“英尺”的意思。
extend=reach, stretch 延伸，伸展
e.g. A railway extends to the next city
结构相似的词组：
extend to a depth of 延伸的深度\ extend to a length of 延伸的长度\ extend to a width of 延伸的宽度
rise to the height of …上升的高度
e.g. The towers rise to a height of nearly 700 feet. (文中的句子)
