As well as killing pain,codeine gives a feeling of calm, of wellbeing,可待因可以止痛，同时让人有镇静，幸福的感觉

as well as，和…一样；不但…而且（谓语与第一主语一致）

He shared in my sorrows as well as in my joys.

他分担我的快乐也分享我的悲伤。

that can be more attractive than the pain-killing itself.这一点可能要比止痛更吸引人

more than超过；多于；不仅仅；非常

This city has a population of more than 1,000,000.

这个城市人口超过一百万。

A publication issued at regular intervals of more than one day.

期刊以多于一天的周期定期出版的出版物

It is incredibly easy to get addicted to pain killers对止痛药上瘾简直轻而易举

get addicted to对...上瘾

Boys are more likely to get addicted to computer games than girls.

在青少年中,男性比女性更易电脑游戏成瘾;