Relative hardness
[機] 相對硬度
?? 詞語組成解析
relative
['r?l?t?v]
adj. 相關的;相對的;相互有關的;比較而言的;
n. 親屬，親戚;相關物;親緣植物（或動物）;[語法學]關系詞;
relat=relate聯系+ive名詞后綴，表人 →親戚
hardness
['hɑrdn?s]
n. 堅硬;<物>硬性;困難;冷酷;
??? 情景例句
He's not making much progress with his English.
他的英語進步不大。
Her parents died when she was a baby and she was raised by her grandparents.
她很小的時候，父母就死了，是祖父母把她帶大的。
Centre School.
在中心學校。