backgroud的用法和樣例：
辭彙搭配
- recede into the background 不再突出(不再重要...
- drive into the background 推到幕後,置於次要的...
- push into the background 推到幕後,置於次要的...
- remain in the background 暗中
- keep in the background 暗中
- stay in the background 留在幕後
- throw into the background 推到幕後,置於次要的...
- in the background 不露面
- stand in the background 處於隱蔽地位,不出面...
- melt into the background 逐漸消失,漸漸由濃變...
