念音

R49  I am often seen on the ground;

                Flat and smooth I am often found.

                Only five letters make my name;

                Forward or backwards, I'm the same.

〔译注〕 我常被看见在地上;

常被发现扁平而光滑;

只有五个字母造成我的名,

往前或往后看,我都是一个样。

〔提问〕 If I am an instrument (器物) for determining (判定) a surface (表面), what am I?

〔谜底〕 l____

 

 

 

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