The shipping crates have rigid frames, so they cannot be folded for return delivery.

這些貨運板條箱的框架是固定的，因此退貨時無法折疊。

Our meeting schedule is too rigid to fit in a last-minute call with the client.

我們的會議時程太死板，無法臨時安排與客戶的通話。

The hotel's rigid check-in time of 3 p.m. frustrated travelers arriving on early flights.

飯店固定下午三點才能入住，讓搭早班機抵達的旅客很困擾。