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be committed to The researchers do not yet know for sure what purpose the clam’s photonics serve, but have found that the flashing rate increases in tests that mimic the looming of a predator, suggesting that the display serves to ______ such threats. 研究者尚未明确知晓这类蛤蜊的发光系统用途何在，但他们发现在模仿天敌逼近的实验中，光闪烁的频率上升了，这意味着闪烁可能是为了避免这类威胁。