It's dated 1640, and it's signed by two great Indians.
注明的日期是1640年，由两个伟大的印第安人在上面签了字。
The medium consists of RPMI-1640 medium and the serum alternate.
培养基由rpmi - 1640培养基和上述血清替代剂组成。
000% : Increase in tobacco exports from the Chesapeake colonies from 1640 to 1700.
36000%：从1640年到1700年，从切萨皮克殖民地出口的烟草增加了36000%。
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