1、concentrate
全神贯注;集中（心思）
It was up to him to concentrate on his studies and make something of himself.
是否能专心学习并取得一定成就要靠他自己。
Water companies should concentrate on reducing waste instead of building new reservoirs.
自来水公司应该集中精力减少水浪费，而不是修建新水库。
使集中;使汇集
Italy's industrial districts are concentrated in its north-central and north-eastern regions.
意大利的工业区集中在该国中北部和东北部地区。
Most development has been concentrated in and around cities.
土地开发主要集中在城市及周边地区。
2、vanish
消失;失踪;突然不见
He just vanished and was never seen again.
他就这么消失了，再也没人见到过他。
The aircraft vanished without trace.
飞机消失得无影无踪。
(物种）灭绝;（传统）消亡
Near the end of Devonian times, thirty percent of all animal life vanished.
在泥盆纪末期，30％的动物物种都灭绝了。
all the species of birds that had vanished from Iowa.
艾奥瓦州所有消失了的鸟类物种