ground: an area of interest, knowledge or ideas (興趣、知識或思想的)范圍,領域
He managed to cover a lot of ground in a short talk. 他在簡短的談話中涵蓋了許多領域.
We had to go over the same ground(= talk about the same things again)in class the next day. 我們得在第二天的課上討論同樣的話題.
You're on dangerous ground(= talking about ideas that are likely to offend somebody or make people angry)if you criticize his family. 你要是批評他的家人可就惹麻煩了.
I thought I was on safe ground(= talking about a suitable subject)discussing music with her. 我以為與她一起討論音樂是穩妥的.
He was back on familiar ground, dealing with the customers. 他又干起了與顧客打交道的老本行.
They are fighting the Conservatives on their own ground. 他們以保守黨人自己的邏輯在和他們斗爭.

narrow something↔down (to something): to reduce the number of possibilities or choices 把(可能性或選擇)縮小(到);縮小范圍
We have narrowed down the list to four candidates. 我們把范圍縮小到四位候選者身上.

Go for: to be attracted by somebody/something; to like or prefer somebody/something 被...所吸引;(更)喜歡某人(或某事物)
She goes for tall slim men. 她喜歡瘦高個子的男人.
I don't really go for modern art. 我并不是很喜歡現代藝術.

at (your) ease: relaxed and confident and not nervous or embarrassed 舒適;自由自在;無拘無束
I never feel completely at ease with him. 我跟他在一起總感到不是很自在.