The cut-off valve type, the internal leakage is not allowed.
对于截断阀类来说，内漏是不允许的。
People are not allowed to cut down trees.
现在人们不能砍树了。
Young trees are not allowed to cut down in some countries.
在一些国家不答应砍伐小树。
We are not allowed to cut down trees.
我们是不允许砍伐树木的。
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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