When they hibernate, their ECG is very complicated and their individual difference is apparent.
在冬季由于花栗鼠处于冬眠阵不同时相，其心电图变化复杂，个体差异较大。
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They hibernate during the winter cold; and their large litters help them maintain their population.
它们依靠冬眠来度过寒冷的冬季，而它们的种群则靠它们强大的繁殖力来维持。
They all hibernate.
它们都冬眠。
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