s. not explained
s. having the reason or cause not made clear
[法] 未经说明的, 未经解释的
1. The scientist found an unexplained phenomenon in the experiment.
科学家在实验中发现了一种无法解释的现象。
2. There was an unexplained delay in the delivery of the package.
包裹的送达出现了无法解释的延迟。
3. She received an unexplained phone call late at night.
她在深夜接到了一个无法解释的电话。