The law is not the same at morning and at night.
早上的法令跟晚上的不一样;朝令夕改.
Gail: It's totally unfair. They keep moving the goalposts.
盖儿: 这一点都不公平. 他们一直朝令夕改.
The rules must not be constantly changing.
规则不得朝令夕改.
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