formal
adj.美 /ˈfɔrməl/英 /ˈfɔːməl/
正式的；拘谨的；合乎礼仪的
following official rules / serious and polite / traditional
例句
We wore formal clothes to the graduation ceremony.
我们穿正装参加了毕业典礼。
His teacher gave him formal permission to leave early.
老师正式批准他提前离开。
怎么记
form+al→按‘形式’严格要求的
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