sentences: if something is used by a mainland to wreck something else, then that something is required to perform that roughness
docs: mainland is land. wreck is ship. heavy_machinery is tangible_thing. clearing_enemy is physical_destruction_event. separating_mixture is physical_destruction_event. toxic_chemicals_need_to has special_trash_receptical clearing is film. junk is traditional_chinese_sailing_ship. debris is rubbish.