punctually
adv. 准时地，如期地
例句
My guest arrived punctually.
我的客人准时到了。
《柯林斯英汉双解大词典》
Punctually at nine o'clock the doctor arrived.
医生准时在九点钟到达。
They always pay punctually.
他们一向按时付款。
《牛津词典》
