Background density
[计] 背景密度
🧩 词语组成解析
🗣️ 情景例句
visiting places of revolutionary interest, outings, parties.
参观革命圣地，出去郊游，或者举办晚会。
As the touchstone tries gold, so gold tries man.
试金石可以试金，正如黄金可以试人。
for it is then almost ready to undertake heavy work and can begin to earn its keep straight away.
这个年龄的象差不多已能干重活，可以很快挣回饲养它的开支。