B cells are the principal effector cells of the humoral arm of the immune system, whereas T cells are the principal effector cells of the cellular arm of the immune system.是什么意思_B cells are the principal effector cells of the humoral arm of the immune system, whereas T cells are the principal effector cells of the cellular arm of the immune system.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句