in sequence   依次，逐一
at stake   在危险中，利害攸关
in accordance with 与……一致
on behalf of  代表……，为了……
accustomed to  习惯于
on the sly   偷偷地，冷不防地
in excess of  超过
to and fro   来来回回
on schedule   按预定时间
on sight   一见就……，立即

点睛：应用范围广泛的词组学习

【例句】Prolonged exposure to these pollutants may result in chronic disease. 
长期接近这些污染气体，就会引起各种慢性疾病。

【例句】The Chinese nation has reached a point where its very existence is at stake.
中华民族到了这生死存亡的关头。