1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time" (see similar (adj.)), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. Related: Simultaneously.
中文解释
1、simul-t-aneous. simul- "at the same time".2、其中的字母t是模仿单词instantaneous、spontaneous等的形式而来，但是这些单词中的字母t是词根的一部分，而simultaneous中的字母t则不是，因此这种模仿只是模仿其表象、形式而已。3、后缀-aneous来源于拉丁语后缀：-aneus，由后缀-ane(它是后缀-an的一种变体，用于分化出有关联的新含义)和-us复合而成，由于在很多情形下，英语后缀-ous等价于拉丁语后缀-us，所以：-aneus => -aneous.
实用例句
1. There were several simultaneous attacks by the rebels.
反叛者同时发动了几起攻击。
来自《权威词典》
2. The two simultaneous shots sounded like one.
那同时发出的两声枪响听起来像是一响.
来自《简明英汉词典》
3. We need a simultaneous interpreter.
我们需要一个同声翻译.
来自《简明英汉词典》
4. This event was almost simultaneous with that one.
这件事几乎是与那件事同时发生的.
来自《现代英汉综合大词典》
5. The conference hall is provided with facilities for simultaneous interpretation in five languages.