Question: where is a simple gear train used in real life
[{'answer': 'Automobile drivetrains', 'provenance': [{'wikipedia_id': '1956881', 'title': 'Gear train', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 22, 'bleu_score': 1.0, 'section': 'Section::::Automotive applications.\n'}]}, {'provenance': [{'wikipedia_id': '1956881', 'title': 'Gear train', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12658061971529355826}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1956881', 'title': 'Gear train', 'start_paragraph_id': 67, 'start_character': 0, 'end_paragraph_id': 67, 'end_character': 827, 'bleu_score': 0.9850176677359421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12658061971529355826}, 'section': 'Section::::Automotive applications.\n'}]}, {'provenance': [{'wikipedia_id': '1956881', 'title': 'Gear train', 'section': 'Section::::Automotive applications.\n', 'start_paragraph_id': 67, 'end_paragraph_id': 67, 'meta': {'evidence_span': ['Automobile drivetrains generally have two or more major areas where gearing is used.', 'Automobile drivetrains', 'Automobile drivetrains generally have two or more major areas where gearing is used']}}]}]