base

他那卑劣的行为让所有朋友都感到失望。

His ___base behavior disappointed all his friends.

这位候选人对对手的下流言论让他输掉了选举。

The candidate's ___base remarks about his opponent cost him the election.

这位工匠拒绝使用劣等材料，坚持只用最好的银和金。

The artisan refused to work with ___base materials, insisting on the finest silver and gold.