短语总结：

by the seat of one's pants:在没有客观依据、茫无头绪的情况下摸索行事。

eg: The teachers are not trained to recognize it.They're flying by the seat of their pants.

老师们并不是靠受教训对此形成认识的。他们全靠自己摸索。

2. back up: 支持，倒退，（资料）备份

eg: He backed up his arguments with facts.

他以事实支持自己的论点。

true: 适用，有效

eg:Does this rule hold true all the time?

这条规定一直有效吗？

the board:包括一切地，全面地

eg:It is very cold outside, you'd better come indoors across the board.

外面很冷，你们所有人会好都进屋。