The shipowner has still held a merchant fleet of seven cargo-vessels.

这个船东仍拥有一支7艘货船的商船队。

《新英汉大辞典》

While navy boats from a number of countries are patrolling the area, there are too many merchant vessels around the Gulf of Aden for them to be an effective deterrent.

尽管多个国家的海军船只在这一海域巡逻，但亚丁湾附近大量的商业船只足以让海盗继续顶风作案。

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It seems absurd that modern day pirates can board and overpower huge tankers and merchant ships and yet sitting low in the water these vessels are vulnerable to attack.

现代的海盗可以登上并击败大型油轮和商船，这真是荒谬。尤其是那些水位比较低的船只更容易遭到袭击。

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