不大于英文

翻译如下：

不超过

根据语境not exceeding、not more than都可以。

例句：

The diaphragm walling is usually cast in sections not exceeding 6meters in length.

通常，地下连续墙分段施工每段长度一般不超过6米。

Neither the distance from A to b nor from A to c exceeds 100mm.Neither the distance of A to b nor A to c is more than 100mm.

the distances of ab and ac are less or equal to 100 mm

less than

no more than adv. 不超过，无非;只是;至多;只不过more than: 仅仅

> larger than< smaller than= equals to