变量指的是在各种不同的条件下会得出各种不同的数值。
A variable is something which has different values under different conditions.
防电墙技术，确保在各种洗浴条件下都安全，万无一失。
Electricity guard technology ensures safety in all conditions of showers.
防电墙技术，确保在各种洗浴条件下都安全，万无一失。
Electricity guard technology ensures safety in all conditions of showers.
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