pénétration par l'arrière d'un des caissons BT puis passage的翻译：penetration by the back of a casing BT then passage 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

penetration from the back of one of the LV and then pass

penetration by the back of a casing BT then passage

penetration by the back of one of boxes BT then passage

Penetration by the back of one of the caissons BT then passage

penetration by the back of a casing BT then passage