Billy: So what did you get?
Jennifer: It's all in the bag.
Billy: What's this? Essential oil? Wow! This stuff is expensive.
Jennifer: I need that to relax. I'm going to put a few drops in my bath water.
Billy: How is oil supposed to make you relax?
Jennifer: They all have essence of flowers in them.
Billy: [Opening the little bottles] Mmmm. They smell nice.

essential oil (n.) 　 精油。essential是「精華的，精粹的」，名詞是essence

比 利：那你買了什么？
珍妮花：全在袋子里。
比 利：這是啥??？油精？哇！這玩意兒可貴了。
珍妮花：我需要它來幫我放松。我要在我的洗澡水里加上幾滴。
比 利：油要怎么幫你放松？
珍妮花：它們里頭都有花香精華。
比 利：（打開小瓶子）嗯。很好聞。