“撞树”这个曾听起来颇为怪异的举动，现在却成为在中老年人中非常“时尚”的养生法则，这是为什么呢？
那只山羊以头撞树。
每次你为了事情进展顺利而大肆庆祝的时候也不一定非要高兴得“撞树”。
You don't have to "knock wood" every time you congratulate yourself that things have been going well with you.
波俄官员称，飞机在靠近斯摩棱斯克机场时遇到浓雾，撞树后，无人生还。
Polish and Russian officials said no-one survived after the plane apparently hit trees as it approached Smolensk airport in thick fog.
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