新概念第二册Lesson88Trappe

Sixmenhavebeentrappedinaminefor

seventeenhours.Iftheyarenotbrought

tothesurfacesoontheymaylosetheir

lives.However,rescueoperationsare

provingdifficult.Ifexplosivesareused,

vibrationswillcausetheroofofthemine

tocollapse.Rescueworkersarethereforedrillingaholeonthenorthsideofthe

mine.Theyintendtobringthemenupinaspecialcapsule.Iftherehadnotbeenahardlayerofrockbeneaththesoil,they

wouldhave







































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