Thousands of trees are cut down.
成千上万的树被砍伐。
The barren trees are cut down by the old man.
那贫瘠的土地几乎不长庄稼。
The barren trees are cut down by the old man.
老人砍了那些不结果的树。
Many trees are cut down to build more factories.
许多树木被砍伐，建立更多的工厂。
Thousands of trees are cut down in the forest every year.
在森林中每年有数以千计的树被砍倒。
At present, many trees are cut down and used to make chopsticks.
目前很多树都被砍下用来做筷子。
When trees are cut down, there is nothing to hold the soil in place.
树木被砍伐了，山坡上就没有什么东西能够把土壤保持住了。
We know that if too many trees are cut down, forests will disappear.
我们都知道如果砍伐太多的树木，森林就会消失。
We know that if too many trees are cut down, forests will disappear.
假如没有节制的砍伐太多的林木，森林将会消失，这个我们都知道。
People are not a11owed to cut down trees when they are still small.
当树还小的时候，是不允许人们砍的。
Today, too many trees are still being cut down in the USA.
今天，在美国仍有大量的树木在不断地被砍伐。
Are these trees going to be cut down? — Yes, they are.
这些树将被砍倒吗？ - - -是的，将被砍倒。
People are not allowed to cut down trees.
现在人们不能砍树了。
More and more trees are being cut down.
越来越多的树木被砍伐。
Young trees are not allowed to cut down in some countries.
在一些国家不答应砍伐小树。
No need to cut down the trees as they are helpful in structural base support.
不需要砍伐树木，因为它们有助于结构基础的支持。
We are not allowed to cut down trees.
我们是不允许砍伐树木的。
There are fewer tigers now than before, because people cut down more trees.
由于人们砍伐森林，东北虎越来越少。
The old trees are all cut down and the young trees are growing clean.
老树全被砍倒了，小树在茁壮成长。
We are going to reduce the number of trees being cut down.
我们要减少砍伐的树的数量。
Trees are often cut down for fuel wood.
树木经常作为燃材被砍伐。
For example, people are not allowed to cut down trees. Otherwise, they will be punished.
比如，人们不能砍伐树木，否则将会受到惩罚；
For example, people are not allowed to cut down trees. Otherwise, they will be punished.
比如，人们不能砍伐树木，否则将会受到惩罚；
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