The ALA notes that it may be particularly difficult to tell when infants and preschool age children have the flu.

美国肺脏协会指出，判断婴儿和学龄前儿童何时会患流感可能尤其困难。

youdao

Experts hesitate to put a figure on the number of toys children should have, but many believe two dozen is enough for children of preschool age.

专家们对儿童应该拥有的玩具数量还不能给出具体数字，但很多人认为24个对于学龄前儿童来说足够了。

youdao

The aim of this study was to analyze early risk factors and protective factors for allergic rhinitis at preschool age.

这项研究的主要目的是分析学龄期前过敏性鼻炎的早期风险因素和保护因素。

youdao

Often, more time with parents is best for preschool age children.

FORBES: Obama's Preschool Proposal Is The Magical Fantasy Of A Preschool Student

Additionally, Comcast will launch Disney Junior, a new 24-hour basic channel for preschool-age children, parents and caregivers.

ENGADGET: Comcast, Disney TV deal opens up access on multiple screens, tightens VOD strings

Before Tuesday's vote, Mar cited a study released this week by Yale University's Rudd Center for Food Policy and Obesity, which examined 12 popular restaurant chains and found only 12 out of more than 3, 000 kids' meal combinations met the nutritional guidelines for preschool-age children.

CNN: Mayor vetoes San Francisco ban on Happy Meals with toys