hallmark
noun [ C ] uk/ˈhɔːl.mɑːk/ us/ˈhɑːl.mɑːrk/
(CHARACTERISTIC)
特征，特点
a typical characteristic or feature of a person or thing
Simplicity is a hallmark of this design. 简洁是该设计的一个特点。
This explosion bears/has all the hallmarks of (= is likely to have been) a terrorist attack. 这次爆炸带有恐怖袭击的所有特征。
(MARK)
（英国金银制品上表示产地、生产日期和纯度的）纯度印记
in the UK, an official mark put on objects made of gold or silver that shows their place and year of origin and how pure the metal is that is used to make them
hallmark
verb [ T ] uk/ˈhɔːl.mɑːk/ us/ˈhɑːl.mɑːrk/
UK给…打上纯度印记
to put an official mark on an object made of gold or silver