Sinus
n. 竇, 靜脈竇, 凹陷處
? 同義詞
?? 牛津釋義
sinus
n
cavity in a bone, esp any of the air-filled spaces in the skull that are connected to the nostrils 竇（骨骼中的空穴, 尤指顱骨中的）.
?? 醫學釋義
竇房結，竇
??? 情景例句
I don't know.
我不知道。
To operate a steam locomotive
駕駛蒸汽機車
Now, dressed in a blue uniform and with a rifle over his shoulder, the prisoner marched boldly up and down in front of the camp.
現在他身穿藍軍裝，肩扛步槍，在軍營門前大膽地來回走看。