直接检眼镜检查眼底，若需使用扩瞳药滴眼，扩大瞳孔检查之前，需询问有无青光眼家族史或疾病史，使用非接触式眼压计检查眼压
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The language _____ which he told the story was unknown to us.
He has read the novel ____ which I spoke before.
The teacher asked s a question, the answer ____ which proved very illuminating （有启发）.
This colorless gas is called oxygen, ____ which we can rescue patients.
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