1.be under way 進(jìn)行中;正在開展
So some sort of shift seems to be under way.
因此,某種變化似乎正在進(jìn)行。
2.fan out 大面積擴(kuò)散
It has little opportunity to fan out across a large population of pigs or evolve a strain that could be transmitted to humans.
這個(gè)病毒很難有機(jī)會(huì)大面積地在豬群中擴(kuò)散,也鮮能進(jìn)化成能感染人的病毒。
3.patrol the street 在街上巡邏
Policemen patrol the streets.
警察在街上巡邏。