the holy grail

剑桥词典

(also the Holy Grail)
a cup believed to have been used by Jesus Christ at the meal before his death
聖盃（傳說耶穌在最後的晚餐上使用過）

something that is extremely difficult to find or get
極難找到（或得到）之物
Sustained nuclear fusion is the holy grail of the power industry . 能持久反應的核聚變是電力工業夢寐以求的“聖盃”。 返回 the holy grail