drop a,the,his,etc.bombshell:猶如擲了一顆炸彈,突如其來地宣布使人震驚且通常令人不快的事
She dropped a bombshell at the meeting and announced that she was leaving.
她在會上宣布了令人吃驚的消息,說她將要離開.
It was then that he dropped the bombshell--he wasn't planning to come with us.
那時他突然宣布一個令人不快的消息,他不準備跟我們一起去了.
a drop in the bucket/ocean:an amount of something that is too small or unimportant to make any real difference to a situation 滄海一粟;九牛一毛
$10 million is only a drop in the bucket compared to what is needed to help these people effectively.
要有效地幫助這些人,1000萬美元只是九牛一毛而已.