他是一个三岁的男孩。
一个三岁的男孩通过朗读他的A到Z图画书教会我一些俄语。
A three-year-old boy taught me some Russian by reading from his A-Z picture book.
据官方消息，一个三岁的男孩爬进汽车里找玩具，却无法出去，最终被困死在车里。
A 3-year-old boy who wandered into a car while looking for his toy died after being unable to get out of the vehicle, according to authorities.
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