What Happened: he was experimenting with chicle, the SAP from a South American tree, as a substitute for rubber.
事情发生的经过：他在用chicle，一种南美洲的树液做实验，以寻找橡胶的替代物。
What Happened: he was experimenting with chicle, the SAP from a South American tree, as a substitute for rubber.
事情发生的经过：他在用chicle，一种南美洲的树液做实验，以寻找橡胶的替代物。
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