noun🔗Share先兆，前兆，先驱。 That which precurses: a forerunner, predecessor, or indicator of approaching events."Rising interest rates can be precursors to an economic recession. "利率上升可能是经济衰退的先兆。historyeventsigntimeChat with AIVocabulary GamePractice Reading
noun🔗Share前体，先质 One of the compounds that participates in the chemical reaction that produces another compound."Simple sugars and amino acids are precursors to more complex molecules like starch and proteins. "简单的糖类和氨基酸是淀粉和蛋白质等更复杂分子的前体。compoundchemistrysubstancebiochemistryChat with AIVocabulary GamePractice Reading
