small potatoes

1. N-UNCOUNT If you say that something is small potatoes, you mean that it is unimportant in comparison with something else. 不足道的小事; 小人物[美國英語] [非正式]

Our monumental worries are often small potatoes in the larger scheme of life. 天大的憂慮在生活的汪洋中也不過是滄海一粟。