【詞組講解】
Perfect conditions mean that you aren't in water or sweating, two things that usually go hand in hand with the sun. This also doesn't reflect sunscreen that can rub off from your clothing.
理想的條件意味著你不是在水里或出汗。而這兩個事情通常和陽光密切聯系在一起。但這也并不反應防曬霜會被你的衣服所擦掉。
rub off 表示“ (使)摩擦掉;(使)減色”,例如:
A shame does not rub off.
恥辱無法抹滅。
With the passing of time, some of the glitter of the achievement has rubbed off.
隨著時間的流逝, 這一光輝的成就已有所減色。