If a relationship is strained, problems are spoiling it.(关系)紧张的,恶化的
Relations between the two countries have become strained (= difficult) recently.最近两国关系变得紧张起来。
showing that someone is nervous or worried紧张的,焦虑的,神色不安的
She was looking strained and had dark circles beneath her eyes.她显得焦虑不安,眼睛下面有了黑眼圈。
Jean felt uncomfortable but managed to force a strained smile.琼觉得不舒服,但仍然勉强挤出了一丝笑容。