dà gài
què shí
huì chéng
____
当细菌外毒素再次侵入人体后,主要是体液免疫发挥作用,其“反应阶段”和“效应阶段”的免疫过程分别是( )
—This physics problem is too difficult. Can you show me _______, Li Lin?
—Of course.