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Vaccine supplies started to run dry as the flu
outbreak
reached epidemic proportions. 由于流感爆发已达疫情级别，疫苗供应开始消耗殆尽。
I had a
breakdown
in the middle of the road. 我的汽车在半路上抛锚了。
They were riding along at
breakneck
speed. 他们正以极快的速度骑行。
Scientists are hoping for a
breakthrough
in the search for a cure for cancer. 科学家们希望在治愈癌症的研究上取得突破。