Treasury obligations
un. 国库债务
🧩 词语组成解析
n. 义务；债务；承付款项（obligation的复数）
🗣️ 情景例句
Who is that?
你是谁？
Didn't I tell you before?
我不是告诉过你吗？
The most economical age to capture an elephant for training is between fifteen and twenty years,
捕捉15至20岁之间年龄的大象进行驯练最为经济。