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[美国英语] [非正式]

Our monumental worries are often small potatoes in the larger scheme of life. 天大的忧虑在生活的汪洋中也不过是沧海一粟。