婴儿早产3个月，体重只有3磅5盎司。The baby was born three months early weighing only 3 lb 5oz.早产婴儿必须靠静脉输入喂养。Premature babies have to be fed intravenously.那个早产的婴儿很健康.The premature baby is doing well....
He warned the public to be vigilant and report anything suspicious.他警告公众要提高警惕，遇到任何可疑情况都要报告。A pilot must remain vigilant at all times.飞行员必须随时保持警惕。He has to learn how to remain vigilant through these long nights.他得学会如何在这漫长...