A point that Democratic presidential contenders like to hone in on as they attack Trump's economic policies. Economy and a government that works for all of us, not wealthy campaign contributors.上述句中出现了短语hone in on 是什么含义？如何使用？ 词典上没找到。
...服服帖帖，幻化无穷，不由让人心旷神怡。It is quite an honor to have the luxury of observing the making of sand
sculpture on the flat dune by artists in whose skillful hands the formless sand
can perform, as the artists wish, countless forms, which makes us stunning and
delightful....
...s of people, both above and below the offending executive and including my own boss if necessary, so that everyone involved can see the rewards for teamwork and the drawbacks of non-cooperation.请教曹老师，both...and...做连词也可以连接两个介词短语吗？