Hallmarking
v. 給（金、銀）打上純度印記( hallmark的現在分詞 )
??? 情景例句
He was ill at ease with people whom he didn't understand.
他和不熟悉的人在一起感到不自在。
Until when?
借到什么時候？
Yu Yan and Jim were neck and neck. They both passed on their sticks at the same time.
余延和吉姆跑得一樣快。