The safety problem of ship operation has appeared because that there are too many ships in limited maritime space.
有限的航行海域中所承载的船舶数量越来越多，由此带来船舶营运的安全性问题。
The safety problem of ship operation has appeared because that there are too many ships in limited maritime space.
有限的航行海域中所承载的船舶数量越来越多，由此带来船舶营运的安全性问题。
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