Beryllocene
二茂铍
🗣️ 情景例句
John Marchetta gave me my start here six years ago,
六年前 ，John Marchetta让我在这儿起步，
An idle youth, a needy age.
少壮不努力，老大徒伤悲。
What is the deadline for submitting the quotation?
报价截止日是哪一天？