1.Two weeks ago, criminals sprayed acid in the faces of people to rob them of their motorbikes.
rob of抢夺(某人)…
They knocked me down and robbed me of my wallet.
他们将我击倒并抢走了我的钱包
。2.I am confident that we are stepping up our response to this crime and we are looking for a safer way to identify some of the substances on the streets.
step up增加(数量等);提高(速度、强度等)
He urged donors to step up their efforts to send aid to Somalia.
他敦促各捐赠方加快速度将援助物资送往索马里
。