Better at the tasks at hand? Happier?

　　更擅長(zhǎng)手頭的工作?更快樂?

　　Being better at those things meant a greater chance of survival ．

　　更擅長(zhǎng)做那些事情能增加生存的幾率。

　　Eyesight doesn't get any better at my time of life.

　　到我這把年紀(jì)，視力絕不會(huì)變好的。