Immunology is the science of the body's defence system: how we notice germs, fight them, remember them, and sometimes stop a disease before it starts. Vaccines, allergies, and illnesses where the body attacks itself all sit in this field.

Immunology is the science of the body's defence systemimmunology是研究人體防禦系統的科學 how we notice germs, fight them, remember them我們怎麼發現病菌、對抗病菌、記住病菌 and sometimes stop a disease before it starts有時候還能在疾病發生前就擋下來 Vaccines, allergies, and illnesses where the body attacks itself疫苗、過敏，還有身體攻擊自己的疾病 all sit in this field都屬於這個領域

The learner-dictionary line says it is the study of preventing disease and of how the body reacts to disease, and that is the door in — though actually it is narrower than all of 'preventing disease'. Washing your hands is health advice, not immunology; a vaccine is immunology, because it teaches the defence system.

The learner-dictionary line says學習型字典的定義說 it is the study of preventing disease and of how the body reacts to disease這是研究預防疾病、以及身體如何對抗疾病的學科 and that is the door in這算是入門的說法 though actually it is narrower than all of 'preventing disease'不過其實它比「預防疾病」這整個範圍要窄 Washing your hands is health advice, not immunology洗手是衛生保健建議，不是immunology a vaccine is immunology疫苗才算是immunology because it teaches the defence system因為疫苗是在教導防禦系統

People who work in it are immunologists. It is a formal science word, for textbooks, labs, and hospital reports, not for chatting about a cold at dinner — even though a cold is exactly the kind of fight this science studies.

People who work in it are immunologists在這個領域工作的人叫immunologist It is a formal science word這是一個正式的科學用詞 for textbooks, labs, and hospital reports用在教科書、實驗室和醫院報告裡 not for chatting about a cold at dinner不是拿來在飯桌上聊感冒用的 even though a cold is exactly the kind of fight this science studies儘管感冒正好就是這門科學研究的那種對抗