It's an interesting scientific phenomenon, but of no practicaluse whatever.
这是一种有趣的科学现象，但没有什么实际用途。
《柯林斯英汉双解大词典》
2
The early humans also found a practicaluse for their discovery, such as storing things like grain—although there were drawbacks.
早期人类也找到了他们的发现的实际用途，比如储存像谷物这样的东西——尽管还有一些缺点。
3
He would rather be a plumber's mate and do a real job that requires doing than learning about hydrostatics sitting at a desk, without understanding what practicaluse they are going to be.