There are no hard and fast rules about the age a child can start self-care safely.

对于多大的孩子可以开始自己照顾自己，并没有明确限定。

youdao

I wish I had an easy answer for determining at what age a child can go online by themselves.

我希望我有个简单的答案，来回答多大的孩子可以独自上网。

youdao

Most vintners let the wine age a bit so bacteria can turn malic acid into the "softer," "rounder" lactic acid.

大多酿酒师会把红酒存放一段时间，细菌会把苹果酸转化成更“柔和”、更“圆润”的乳酸。

youdao

On an average day, nearly everyone fifteen years of age and older took part in a non-work activity like watching television, socializing or exercising.

VOA: special.2011.07.22

OK. Now. Think for a second about computing the average age of the faculty.

好，想想怎么,计算全体教员的平均年龄吧。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's bad enough to say that a lot of the girls get pregnant at a younger age than opposed to here.

与这里情况相反，许多女孩在很年轻时就做了妈妈，这太糟糕了。

波多黎各的美女 - SpeakingMax英语口语达人

Or even use algorithms to modify vocal features to convey emotion or age a character.

ENGADGET

Troublingly, when Scottrade asked what age a person should begin retirement savings, Gen Y respondents replied 29.

FORBES: A Guide To Jumpstarting A Retirement Plan In Your 20s

Throughout the sale process, Harman and those around him repeatedly insisted that his robust health and vigor made his age a non-issue.

FORBES: What Does Sidney Harman's Death Mean for Newsweek?