Rebound hardness test

rebound [ri'baund;'ri:ˌbaund,ri'baund]

vi. 弹回;从诸如衰败或失望中恢复过来;回荡，回响;抢得篮板球; vt. 使弹回;使回升;使回响; n. 弹回，跳回;反弹球;篮板球;振作，反应;

hardness ['hɑrdnɪs]

n. 坚硬;<物>硬性;困难;冷酷;

test [tɛst]

n. 试验;考验;测验;化验; vt. 测验;考查;考验;勘探; vi. 受试验;受测验;受考验;测得结果;

test =test,tuitness,表示”测试,证据”

Something else I was wondering about was...

我想知道其它事是^

The joy of the heart makes the face merry.

喜形于色。

The only way that they can preserve their history is to recount it as sagas -- legends handed down from one generation of another.These legends are useful because they can tell us something about migrations of people who lived long ago, but none could wri

他们保存历史的唯一办法是将历史当作传说讲述，由讲述人一代接一代地将史实描述为传奇故事口传下来。