When it came — thirty cents — he pinned it up in his trailer, brass-headed tack in each corner.
明信片到了，三十美分。他把它贴在自己车里，四个角用黄铜大头钉钉住。
2
When he found he could not secure my attention for the school course, he gave up the attempt as hopeless and went on a different tack.
当他发现他不能使我的注意力维持在学校的科目上时，就绝望地放弃了这种努力，而另辟蹊径。
3
Fearful of inflation, which has risen to 7.7%, in part because of the weaker currency, the bank has recently reversed tack and sold some of its foreign-currency reserves to prop up the lira.