求翻译：各国海军开始不断地壮大，海岸巡逻和近海防御能力也得到了有效的加强，这使得海盗在18 世纪末到20 世纪初的相当长的时间里几乎销声匿迹是什么意思？

States Navy began to grow, coastal patrol and coastal defense capability has also been strengthening, which makes the pirates almost disappeared in the late 18th century to the early 20th century, for a long time

The Navy started to steadily grow, coastal patrol and coastal defense capacity has also been an effective strengthening pirates in the 18th century to the early 20th century for quite a long time, almost disappeared

The various countries' navy starts to expand unceasingly, the maritime shore patrol and offshore defense capability also obtained the effective enhancement, this causes the pirate to go into hiding nearly in 18 century's end to the beginning of 20th century suitable length time

States Navy continued to grow, coastal patrol and coastal defenses have been effective in strengthening, which makes the pirates in 18 end of the century to the early 20th century a considerable amount of time almost disappeared

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