问题描述：
英语翻译
Employees pay contributions on all of their earnings above the ET（Earnings Threshold）.They pay at a main percentage rate on earnings up to the Upper Earnings Level (UEL) and at a lower percentage rate on all earnings above the UEL.
Employees pay contributions on all of their earnings above the ET（Earnings Threshold）.They pay at a main percentage rate on earnings up to the Upper Earnings Level (UEL) and at a lower percentage rate on all earnings above the UEL.
问题解答：
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