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重点讲解：
1. go down （太阳）落下；
The sun went down and darkness fell.
夕阳西下，夜幕降临。
2. at least （数量）至少，不少于；
It is imperative to continue the treatment for at least two months.
必须继续治疗至少两个月。
3. result in 导致；引起；造成；
Fatigue and stress quickly result in a dull complexion and a furrowed brow.
疲劳和压力会很快导致肤色暗淡无光、额头出现皱纹。
4. in addition to 另外；加之；除…之外；
In addition to these arrangements, extra ambulances will be on duty until midnight.
除了这些安排以外，另增救护车值班至午夜。
