Definition: to not be useful Level: B2
试图和他讲道理没用；他从不听。
Trying to reason with him ___is ___no ___use; he never listens.
我们呼救，但没用，因为周围没人。
We called for help, but it ___was ___no ___use as no one was around.
没有合适的工具，这台设备将毫无用处。
Without proper tools, this equipment will ___be ___of ___no ___use.
