on thorns

continuously uneasy, especially in fear of being detected

焦慮不安，如坐針氈（尤指擔(dān)心被察覺(jué)）

there is no rose without a thorn

(proverb)every apparently desirable situation has its share of trouble or difficulty

(諺)沒(méi)有無(wú)刺的玫瑰；世上沒(méi)有十全十美的事；有樂(lè)必有苦

a thorn in someone's side (或 flesh)

a source of continual annoyance or trouble

經(jīng)常使人苦惱（或生氣）的事（或人）

the pastor has long been a thorn in the side of the regime.

這個(gè)牧師長(zhǎng)期以來(lái)一直是令這個(gè)政權(quán)頭疼的人物。