Upper stem seal
[化] 上閥桿密封
?? 詞語組成解析
upper
['?p?]
adj. 地位較高的;上面的;內地的;地表層的;
n. 鞋幫，靴面;興奮劑;令人興奮的經歷;
stem
[st?m]
n. （花草的）莖;詞干;（高腳酒杯的）腳;煙斗柄;
vt. 遏制[阻止]（液體的流動等）;阻止;封堵;遏止;
seal
[sil]
n. 密封;印章;海豹;封條;
v. 密封;蓋章;決定;封上（信封）;
??? 情景例句
It's certainly a pleasure to meet you.
認識你真是我的榮幸。
I think gray hair makes you look rather distinguished.
我覺得你灰白的頭發使你看上去很嚴肅。
Oh! What a pity!
哎呀！真可惜！