Teen-ager's drug-taking isn't an isolated individual behavior.

Most teen-ager prisoners have unhealthy moral behaviour at school.

他们在校期间多有不良道德行为.

The intelligence of most teen-ager prisoners ( 83 percent ) was lower or had defect.

瑞文标准推理测验智力水平属中下等和缺陷者居多,达 83%.

The relative allelopathic potential of volatile oil from Ageratum was decreased slightly under shady condition.

遮荫条件下,胜红蓟挥发油的相对化感作用强度略有降低.

Objective : To observe the effects of Ageratum-liquid on motility of rats.

目的: 观察藿香正气液及其组方药物对大鼠胃排空及肠推进的影响.

Any of several other plants having flower clusters similar to the ageratum.

类藿香''.'蓟'.''植物花序与藿香''.'蓟'. ''类似的植物.

Television is primarily criticized for its crime shows which may shock many teen-agers.

然而,电视最受人们指责的地方便是播放令许多青少年惊悚的犯罪节目.

The target of this research is teen-agers men long distance races sparetime training of Gansu Province.

本课题研究以甘肃省青少年男子中长跑业余训练为研究对象.

As teen agers she and Muriel would help out in the store.

在十来岁时,她和姐姐一起在家里开的店里帮忙.

We looked down our noses at the fat middle-agers.

我们以一种不屑一顾的眼光去瞄一瞄那些大腹便便的 中年人.

Kids — mine are teen-agers now , too, and away at school.

孩子们——我的孩子们也已经长成了少年, 在外地读书.

Put some teeth in your position when you speak to the teen-agers.

对青少年说话时,必须表明你认真的立场.

The teen-agers of our country all suffer the very good care.

我国的青少年都受到很好的照顾.

The weather is very cold in the Middle Ages.

中世纪时气候很寒冷.

Knight was the top title for field soldiers during the Middle Ages.

欧洲中世纪时期,骑士是步兵中的最高头衔.

A child develops rapidly between the ages of 13 and 16.

孩子在13到16岁之间发育得很快.

I've been knocking away for ages, but nobody has answered the door.

我敲门敲了老半天, 但无人应门.

The history of the town dates back to the Middle Ages.

这个城镇的历史可回溯到中世纪.

John looked into the chronicles of the Middle Ages last week.

约翰在上周浏览了中世纪的编年史.

Back in the dark ages of computing, in about 1980, they started a software company.

早在计算机尚未普及的时代（约1980年），他们就创办了软件公司。

adolescents between the ages of 13 and 18 and the problems they face

13至18岁的青少年以及他们面临的问题