Addition, subtraction, multiplication, and division are binary operations.
加、减、乘、除都是二元运算。
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字减
血管
；字减血管术Addition, subtraction, multiplication, and division are binary operations.
加、减、乘、除都是二元运算。
The difference is found by subtraction.
用减法得出差额。
Objective:To illustrate the value of digital subtraction dacryocystography in the diagnosis of lacrimal duct obstruction.
评价字减泪道术在临床检查泪道阻塞中的应用价值。
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