PS的中文意思、音标与词形变化

[计] 实际顺序, 图象系统, 电源, 保护状态 [化] 磷脂酰丝氨酸

n a note appended to a letter after the signature n a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms n the 16th letter of the Roman alphabet