1. One way to express "情緒低落" in English is "feeling down."2. Another term for this state of mind could be "feeling low."3. If you're describing someone's emotional state, you might say they are "in a funk."4. The phrase "under the weather" is also used colloquially to describe a state of low spirits.5. Additionally, the term "blue" is often used to describe a feeling of sadness or low mood.