1. 半旗：half-length 半身的 | half-mast 半旗 | half-moon 半月
2. 下半旗：half mast the ensign 下半旗 | half mast 下半旗 | half mile rule 半海里法则
3. 降半旗：GLOSSARY 词汇表 (双击查询详细解释) | half-mast 降半旗 | mourning 哀悼
4. 半旗桅杆(旗杆一半的高度)：? volume 大量 | ? half-mast 半旗桅杆(旗杆一半的高度) | ? outrageous 非常规的、过分的
1. （对死者表示尊敬和哀悼的）降半旗
If a flag is flying at half-mast, it is flying from the middle of the pole, not the top, to show respect and sorrow for someone who has just died.
e.g. Flags have been flying at half-mast, and schools, offices and businesses have been closed.
降了半旗，学校、办公楼和商业场所也都关门了。
noun
1. a position some distance below the top of a mast to which a flag is lowered in mourning or to signal distress
Synonym: half-staff