应该翻成---如果你“只”有一个锤子。。。？

if all you have is a hammer, everything looks like a nail

1. With limited tools, single-minded people apply them inappropriately or indiscriminately
2. If a person is familiar with a certain, single subject, or has with them a certain, single instrument, they may have a confirmation bias to believe that it is the answer to/involved in everything.