simultaneous a.同時的，同時存在的
simutaneous a.同時進行的
spontaneous a.自發的；本能的
例句：
How do we know that the signature is contemporaneous with the document?
我們怎樣才能知道這個簽字和文件是同一個時間的呢？
The extraneous "k" has never been explained.
從來沒有人解釋這個不相干的“K”是什么意思。
Simple websites don’t have extraneous information.
簡潔的網站沒有冗余的信息。
To you, it looks like merely extraneous whitespace.
對于您來說，它僅僅是無關緊要的空格。
Death was almost instantaneous.
當時生命垂危。
His hospitality was instantaneous and all-embracing.
他的款待及時而周到。