本文作者： 21ST

VIP教师会员和本期电子版订户登录后下载

LAST week a Japanese company showed a new type of battery (电池). With its power (能量), a 17cm tall robot rope climbed (用绳索爬) to the top of the Grand Canyon (大峡谷) in the US in less than seven hours. The Grand Canyon is about 1,700 feet (510 meters) deep (深).