这条伟大的河上锁链由一条在它南面的栏木所保护起来。
这条栏木是由那些圆木连接起来的。船只要是撞上它就会减速，以使船不会撞到锁链。
The boom, made of logs chained together, was placed so that a ship striking it would be slowed down to the point that it could not break the chain.
这条栏木是由那些圆木连接起来的。船只要是撞上它就会减速，以使船不会撞到锁链。
The boom, made of logs chained together, was placed so that a ship striking it would be slowed down to the point that it could not break the chain.
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