1. 警惕：weather deck 露天甲板 | weather eye 警惕 | weather forecast 天气预报

2. 机警观察：25.water off a duck's back 耳旁风 | 26.weather-eye 机警观察 | 27.wheeler-dealer 精明的(商)人

3. 气象眼：weather exposure test == 风蚀曝露试验 | weather eye == 气象眼 | weather facility == 气象站

4. 气象观察器;气象卫星：weather balloon气象气球 | weather eye 气象观察器;气象卫星 | weather satellite气象卫星

noun

1. vigilant attentiveness

e.g. he keeps a weather eye open for trouble

Synonym: watchfulnessvigilance