(1)
as hungry as a bear
如同字面意思,如同熊一般的餓
I didn't eat all day, so I was as hungry as a bear.
(2)
a drop in the bucket=a drop in the ocean
桶子裡的一小滴,意思就是微不足道;沒啥影響力
That is just a drop in the bucket (which is) compared to what we need.
比起我們所需要的,那只是九牛一毛、微不足道。