[名词解释] active transport (主动运输)
[名词解释] cellular transport (细胞运输)
[名词解释] ligand gated channel (配体-门控通道)
[名词解释] passive transport（被动运输）
[名词解释] channel protein （通道蛋白）
[名词解释] intracellular transport (胞内运输)
