Observation hole
[机] 观察孔
🧩 词语组成解析
hole
[hol]
n. 洞，孔;洞穴，穴;缺陷;<口>绝境;
vt.& vi. （在…上）打洞或穿孔;
vi. 凿洞;（高尔夫球等）进洞;
🗣️ 情景例句
He studied harder to improve his English.
他更加努力提高英语水平。
That's easy for you to say.
你说的容易。
However, this does not always happen.
然而，情况并不都是这样，