Associativity
[计] 结合性
🗣️ 情景例句
for a total of sixteen points.
她一共得十六分。
My brothers must help with the house work at home.
我的兄弟在家里必须帮忙做家务。
Not at all, dear. It was a pleasure.
不必客气，亲爱的。这样我很高兴。