Synonym: come about, fall out, go on, happen, occur, pass, pass off, take place. Similar words: chap., chap, happy, shape, haply, mayhap, happen, haptic. Meaning: [hæp] 
n. an accidental happening. v. come to pass.
n. an accidental happening. v. come to pass. 
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31 Using fish wastes as raw materials, hydrolyzed protein ( HAP ) powder was produced by enzymatic hydrolysis and acidic hydrolysis.
32 Hydrophobically associating polymer (HAP) is a new and ideal polymer at present, which has the characteristics of salt -resistance, thermal endurance and shear-resistance.