成熟白桦树需要达到树龄30年以上、直径20厘米以上才能开孔取汁，一整个采集季能够得到的树液总量也相当有限，树液流出后若不及时处理极易变质。许多企业把采集后的运输时间控制在数小时之内，工厂也因此大多建在林区附近。
While men continued to do state-sanctioned jobs, even as their pay and rations dwindled, it was women who looked for ways to feed their families. They opened businesses, sold goods in the black market or became smugglers.
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