lethal 记忆技巧：leth 遗忘 + al …的 → 最致命的伤害就是被彻底遗忘 → 致命的
a lethal dose of poison
毒药的致死剂量
a lethal weapon
致命的武器
lethargy 记忆技巧：leth 遗忘 + argy → 睡着了就一切都忘了 → 昏睡
the state of not having any energy or enthusiasm for doing things
After the meal, I could feel lethargy overtaking me.
饭后我昏昏欲睡
Symptoms include tiredness, paleness, and lethargy.
症状包括疲倦、脸色苍白、没有精神。
The weather made her lethargic.
那天气使得她无精打采。 listless
They chatted all night long and were listless in class the next morning.
他们整夜都在聊天，第二天课上都无精打采的。
downhearted
No one is downhearted here.
此间没有一个人情绪低落。
It's very easy to get frustrated in this job.
这个工作很容易令人懊恼。
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