名词
中文翻译：焦虑
同义词：
['anxiety', 'tension', 'unease']
例句：
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1. He was so anxious about the exam that he couldn't sleep last night.
他对考试感到非常焦虑，以至于昨晚睡不着。
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2. She felt a deep sense of tension as she prepared for the presentation.
她为演讲感到深深的紧张。
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3. The uncertainty of the future loomed over them, causing much unease.
未来的不确定性让他们感到不安。