Bridges
What kinds of bridges are there?
行走
1 Have you ever stepped on a
stone to get across a puddle or
stream? If you have, you were
using a bridge.
橋
不同尺寸
Bridges are different sizes
and shapes. Some bridges
have straight "legs or supports,
called beams. Other bridges
have curved supports, called
拱橋
arches. Still others actually
45 - Lit
堅強
鋼索
hang from strong steel ropes,
上弦
or cables, that are strung
上面
表面
above the surface of the
bridge. The cables are the
attached to the land on either
end of the bridge.
3 Most bridges go over water,
but some bridges were made to
TEA
JI
carry water. About 2,000 years
ago, the Romans built this kind
of bridge. One such bridge, in
347.
France, had three levels. Water
flowed in the top level, and
人国
70
people and carts traveled on
the two lower levels.
