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毒性学: toxicology
My toxicology textbook is very difficult to understand.
obscurity
This math problem is too obscure, I can't understand it.
dense, abstract, abstruse, recondite
This math problem is very dense.
toxicology
He is an expert in toxicology.
a textbook
Where is my textbook?
胎生学: embryology
He is majoring in embryology at university.
very; extremely / exceedingly; tremendously
It is a very beautiful view.
extraordinary, unusual
I was amazed at his extraordinary talent.
emergency
Please press this button in case of emergency.
self-learning
He learned Japanese through self-study.
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DiQt（ディクト）
無料
★★★★★★★★★★
