9 Big Tunnels

Big Tunnels written by John Lockyer

约翰·洛克耶的《大隧道》

Big tunnels are long, deep holes under the ground. They are used by cars, trains and trucks. Sometimes they have electric lines and water pipes, too. round tunnel Big tunnels are built in different shapes, so they can hold up the rock, earth or water above them.

大隧道是指地下又长又深的洞。 它们被汽车、火车和卡车使用。 有时他们也有电线和水管。 圆形隧道大隧道的形状各不相同，因此它们可以托起上面的岩石、泥土或水。

Rock tunnels have straight walls and a curved top. The arch shape holds up the heavy rock in a mountain. rock tunnel Round tunnels are built through soft ground. Tunnels built under water are round, too. Square tunnels are built under busy city streets.

岩石隧道有直壁和弯曲的顶部。 拱形的形状支撑着山上的巨石。 岩石隧道圆形隧道是在软土地基上修建的。 水下隧道也是圆形的。 在繁忙的城市街道下修建方形隧道。

There are different ways to build a big tunnel. In a rock tunnel, the rock is moved away with explosives. In a round tunnel, a machine cuts through the soft ground. drill A square tunnel is built by digging a big open hole in the ground. The roof is made of concrete and steel.

建造一条大隧道有不同的方法。 在岩石隧道中，岩石是用炸药移动的。 在一个圆形的隧道里，一台机器在松软的地面上开凿。 钻一个方形的隧道是在地上挖一个大的露天洞建成的。 屋顶是用混凝土和钢材建造的。

Some tunnels are dug from each end until they meet in the middle. Other tunnels are dug all the way from one side to the other. laser lights The tunnel-builders use special lights, called laser beams, to keep the tunnel straight.

有些隧道从两端挖到中间。 其他的隧道则是从一边一直挖到另一边。 隧道的建造者使用一种叫做激光束的特殊灯光来保持隧道的笔直。

Building a tunnel is hot and dangerous work. All tunnel-builders wear safety gloves, a hard hat, and hard boots. safety gear Sometimes they wear safety glasses, face masks, and ear protectors.

修建隧道是一项又热又危险的工作。 所有的隧道工人都戴着安全手套、安全帽和硬靴。 有时他们戴上安全眼镜、口罩和护耳。