rigid /ˈrɪdʒɪd/ adj. 死板的；僵硬的

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例句/词组:

The curriculum was too narrow and too rigid.

课程设置过于狭窄和死板。

英语解释：

(often disapproving) (of rules, methods, etc. 规则、方法等) very strict and difficult to change 死板的；僵硬的