十七seventeen通常總共只有十一二個(gè)會(huì)員。

現(xiàn)在將至少有十七個(gè)。Normally it has only had eleven or twelve members in all. Now it will have seventeenat the very least. 最早提及炸藥的是十七世紀(jì)上半葉煉金術(shù)的著作。The earliest mention of explosives are to be found in the alchemical writings of thefirst half of the seventeenth century.