1·An examination is carried out before the insertion of the tube.
插入导管前先要进行检查。
—— 《牛津词典》
2·If you add a word, put an insertion mark in the right place and write the missing word in the blank.
如果你要添加一个单词,在正确的位置做一个插入标记,然后把缺失的单词写在空白处。