1、
They placed the child in an oxygen tent when he had difficulty in breathing.
那孩子呼吸困难时,他们把他放进氧幕里.
词典精选例句
2、
They placed the child in an oxygen tent when he have difficulty in breathing.
那孩子呼吸困难时,他们把他放进氧幕里.
期刊摘选
