On overcast days, however, the birds were disoriented and had trouble locating their food box.
然而，在阴天，这些鸟儿会迷失方向，难以找到食盒的位置。
On overcast days, operators aim the mirrors skyward; sudden sun through clouds could heat the tower so quickly it could be destroyed.
在阴天，工作人员将镜子面向天空；因为突如其来的阳光可能会迅速加热塔顶而破坏。
These are prime hours for exposure to skin-damaging ultraviolet (UV) radiation from the sun, even on overcast days.
这段时间是皮肤受到太阳紫外线照射伤害的主要时段，即使是阴天也是如此。
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