比如，有两个单独的基因是指每一个均可在不同时间或不同组织中开启或关闭。

For instance, having two separate genes means each can be switched on or off at different time or in different tissues.

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然而，那些报告说同时使用风扇和空调的家庭电费花费比单独使用风扇或空调的家庭少。

However, those households that reported using both fans and air conditioners spent less on electricity than those households that used either fans or air conditioners alone.

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目前，在购买高档品物品时同时购买古典音乐或歌剧的CD的交易会得到比单独购买高档物品更高的风险分值。

Now, purchases that combine classical or opera CDs with expensive goods receive a higher score than purchases of high-cost items alone.

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