in proportion to the length of one's service 意味

• 勤続年数｛きんぞく ねんすう｝に応じて
  

• length of service:    《length of (one's) service》勤務年限｛きんむ ねんげん｝、勤続年数｛きんぞく ねんすう｝、在職期限、勤務期間
• in proportion to one's size:    （事業｛じぎょう｝）規模｛きぼ｝に応じて
• in the proportion of one part to four:    1対4の割合で