Heliarc welding
[化] 氦弧焊
?? 詞語組成解析
氦弧
a. 焊的\\n[機] 熔接, 焊接, 鍛接
??? 情景例句
going to the children's ward once or twice a week
每星期就去小兒科病房一、兩次
The napkin is dirty, Would you bring me a clean one, please?
這餐廳是臟的，請你拿個干凈的給我。
He's picking the apples on that tree. He's putting them in a basket.
他在摘那棵樹上的蘋果。他正在把蘋果放進一只籃子里。