形容词
中文翻译：同时的
同义词：
['concurrent', 'concurrently', 'synchronously']
例句：
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1. They were both born in the same year, so they have a simultaneous birthday.
他们同年出生，所以他们有同一天的生日。
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2. The two events happened simultaneously, making it difficult to determine cause and effect.
这两个事件同时发生，使得确定因果关系变得困难。
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3. The scientists conducted experiments simultaneously, observing the results together.
科学家们同时进行实验，观察结果一起。