Constraint matrix

constraint [kən'strent]

n. 强制;限制;约束;

con一起+strain拉紧，压+t → 约束；强迫

matrix ['metrɪks]

n. <数>矩阵;模型;基质;母体，子宫;

matri(mother)+x(名词后缀)→子宫；母体；铸型；模型；母岩

Try again.

再试一次。

I cannot hear the tape.

这卷录音带什么都听不到。

Do you remember one afternoon ten years ago when I came to your house and borrowed a necklace of yours? Pierre, my husband, was working in a government office. We'd been invited to a ball at the palace so I needed to borrow some jewellery.

10年前的一个下午，我到你家借过一条项链，你还记得吗？我的丈夫比尔当时在政府的一个部门工作。我们被邀请参加一个宫庭舞会，所以我需要借一点珠宝首饰。