1. If explosives are used, vibrations will cause the roof of the mine to collapse.
    如果用炸药爆破，震动会引起矿顶塌落。

2. For a fee of $15.60 per jump, Tokyo Roof rented me a flight suit, special shoes, gloves, earplugs(耳塞), a crash helmet, a face mask, a tooth guard and a safety harness (but no parachute).
    蹦极跳每次收费15.60美元，"东京屋顶" 租给我一套飞行服，特殊的鞋子、手套、耳塞、头盔、面罩、护牙套、还有一套安全装备（但是没有降落伞）。