因为首先老人需要照看，孩子也需要人照顾。
For one thing, the old need to be looked after, and their children need to be looked after.
他们说这样做的理由很简单：“狗儿生病就像孩子生病一样需要人照顾。”
The reason, they say, is simple: "a sick dog is as much a dependant as a sick child."
随着时间累积，低生育率不止会儿童数量减少，随着需要人照顾的老年人人口膨胀，处于工作年龄段的人口数量也会减少。
Over time, low birth rates lead not only tofewer children, but also to fewer working-age people just as the percentage ofdependent elders explodes.
但在池塘中养殖的藻类需要人力照顾并且池塘也占用了本可用作他用的土地。
These have to be nurtured in ponds that require attention and occupy land that could be used for other things.
但在池塘中养殖的藻类需要人力照顾并且池塘也占用了本可用作他用的土地。
These have to be nurtured in ponds that require attention and occupy land that could be used for other things.
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