1. This is the traditional adult age in Australia and the USA and the UK.
这是澳大利亚、美国和英国的传统成年年龄。
来自互联网
2. Even though 21 is the traditional adult age in many English-speaking countries the law nowadays is different in each country.
尽管在很多讲英语的国家21岁是传统的成年年龄，但现在每个国家的法律都不一样。
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3. At the age of eighteen the law provides adult responsibilities as well as rights.
18岁时，法律规定了成年人的权利和责任。
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4. At around age 60, "muscles really start to break down," say Kathryn Starr, an aging researcher, "and because of that, the protein needs of an older adult actually increase."
