直到18世纪，人们还依赖于来自植物、动物和人类肌肉的能量来为自身提供动力。
Until the eighteenth century, people relied on energy derived from plants as well as animal and human muscle to provide power.
每个DRACO还包括一个“传递标志”，来自于天然产生的蛋白质，允许其穿过细胞膜，进入任何人类或动物细胞中。
Each DRACO also includes a "delivery tag," taken from naturally occurring proteins, that allows it to cross cell membranes and enter any human or animal cell.
动物实验表明，该物质会诱发肺癌，但相关人类研究还缺乏相关证据。
Animal studies have shown that glass wool fibers cause lung tumors, but there is little evidence from human studies of a risk.
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