While infants laugh up to 300 times a day, that figure falls to an average of 6 laughs a day for teenagers and only 2.5 daily chuckles for those more than 60 years old, the survey found.
调查发现，婴儿一天能笑300次，十几岁的孩子平均一天笑6次，而年龄超过60岁的人一天只笑2.5次。
The RSV antibody titers in neonates and infants decreased rapidly within 6 months after birth and then increased gradually with a maximum level at 7 ~ 14 years old.
婴幼儿RSV抗体水平在生后6个月内迅速降低，6个月以后抗体的滴度随年龄消长，7 -14岁时水平最高。
The RSV antibody titers in neonates and infants decreased rapidly within 6 months after birth and then increased gradually with a maximum level at 7 ~ 14 years old.
婴幼儿RSV抗体水平在生后6个月内迅速降低，6个月以后抗体的滴度随年龄消长，7 -14岁时水平最高。
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