1.heavy rain 大雨;豪雨
例句:Weeks of heavy rain have washed away roads and bridges.
幾周的大雨將道路和橋梁都沖垮了 。
2.warning system 預警系統
例句:Early warning system and satellite surveillance.
預警系統和衛星偵察 。
3.blue alert 藍色預警
例句:In experiments, people exposed to blue light become less sleepy and more alert.
在實驗中,身處于藍光中的人的睡意總是較少,表現得更警覺 。