逆境忍耐
植物组织虽经受逆境对它的影响,但它可通过代谢反应阻止、降低或者修复由逆境造成的损伤,使其仍保持正常的生理活动。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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