即使是刚刚度过90岁生日的老弱人群，也能有办法增加他们身体的肌肉数量和肌力水平。
Even frail people who've already passed their 90th birthday can add muscle mass and strength.
通过吃掉老弱病残和受伤者，鲨鱼协助维持其猎物鱼群的基因健康，同时也使其数量保持平衡。
Sharks help maintain the genetic health of the fish populations they feed on by eating the weak, sick and injured. They also keep their prey populations in balance.
通过吃掉老弱病残和受伤者，鲨鱼协助维持其猎物鱼群的基因健康，同时也使其数量保持平衡。
Sharks help maintain the genetic health of the fish populations they feed on by eating the weak, sick and injured.They also keep their prey populations in balance.
但到2050年，比例将成为1比1.随着日本人越来越老弱，公司要去哪里去寻找充满干劲、精力充沛的员工呢？
By 2050 the ratio will be one to one. As Japan grows old and feeble, where will its companies find dynamic, energetic workers?
在公共汽车上年轻人给老弱病残让座是中国人的传统美德。
It is a traditional Chinese virtue for the young on buses to yield their seats to the old, the weak, the sick and the disabled.
在左边那些可怜地挤作一团的人都是些老弱病幼者。
Those who huddled pitifully together on the left were the old, the infirm, the ill and the very young.
长大时，子女为老弱的父母提供生计和照顾，从而帮助父母。
When grown up, the offspring help the parents by providing sustenance and care to them in their old age and infirmity.
长大时，子女为老弱的父母提供生计和照顾，从而帮助父母。
When grown up, the offspring help the parents by providing sustenance and care to them in their old age and infirmity.
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