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1.concentrate on 集中；全神贯注于
They will concentrate on teaching the basics of reading, writing and arithmetic.
他们将集中教授阅读、写作和算术基础知识。
They should concentrate on rejuvenating the existing vegetation, like grass and shrubs.
他们应该侧重于修整现有的绿化植被，比如草和灌木。
2.at least 至少；最低限度
Try to eat at least four slices of bread a day.
每天尽量至少吃4片面包。
At least three British golf courses are now owned by the Japanese.
现在英国至少有3家高尔夫球场为日本人所有。
