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Vocabulary
1.    Arrhenius equation °¢À×Äá¶ò˹·½³Ìʽ
2.    Arrhennius (Svante August) 1859¡ª¡ª1927 ÈðµäÀí»¯Ñ§¼Ò¡£1903Äê»ñŵ±´¶û»¯ ѧ½±
3.    quantum-mechanical effect Á¿×Ó»úеЧӦ
4.    quantum mechanic Á¿×ÓÁ¦Ñ§
5.    tunnel ÍÚËíµÀ¡£ÕâÀïÖ¸6.    ¹á´©ÊÆÀÝ
7.    tunnel through, onto ´©µ½¡­¡­½øµ½£¬8.    ¹á´©
9.    repulsive Åųâ
10.    activation energy »î»¯ÄÜÁ¿
11.    formaldehyde ¼×È©
12.    polysaccharide ¶àÌÇ´¼£¬13.    ¾ÛºÏø
14.    cellulose ÏËάËØ
15.    starch µí·Û
16.    galactic ÒøºÓµÄ£¬17.    ¾Þ´óµÄ
18.    come into play ¿ªÊ¼»î¶¯/Æð×÷ÓÃ

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1.    However, recent experiment evidence reveals that although the Arrhenius equation is generally accurate in describing the kind of chemical reaction that occurs at relatively high temperature, at temperatures closer to zero a quantum-mechanical effect known as tunneling comes into play; this effect accounts for chemical reactions that are forbidden by the principles of classical chemistry.
2.    Specifically, entire molecules can tunnel through the barriers of repulsive forces from other molecules and chemically react even though these molecules do not have sufficient energy, according to classical chemistry, to overcome the repulsive barrier.
3.    Recently researchers have developed the concept of tunneling temperature: the temperature below which tunneling transitions greatly outnumber Arrhenius transitions, and classical mechanics gives way to its quantum counterpart.

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