求翻译：In Great Britain the system of Coast Guard is very different. There are a small number of them, called lifeboatmen, who go out to help ships in trouble. These brave men often risk their lives, but they receive no money from their work. They live in small towns on the coast, and most have their jobs. The special lifeboats that they need are provided by the Royal National Lifeboat Institution, a private group which depends completely on money from private people. The R.N.L.I. does not accept any money from the government. As a result, it cannot always buy the best and most modern lifeboats. For example, about ten years ago, British researchers began to criticize(批评) the lifeboats which were in use that time. According to their studies, the lifeboats never sank, but they turned over in certain sea conditions and stayed upside down in the water. However, there was a new kind of lifeboat that did not turn over, The R.N.L.I. began to buy this safer kind of boat, but they could buy one or two every year.是什么意思？

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