求翻译：Although everyone in Britain can have free treatment under the NHS, it is also possible for him to have treatment done privately, for which he has to pay. Some people have private health insurance to help them pay for private treatment. Under the NHS, people who need to go to hospital may have to wait for a long time on a waiting list for their treatment. Anyone who is very ill can call an ambulance and get taken to hospital for free urgent medical treatment. Ambulances are a free service in Britain.是什么意思？

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