across表示橫過,即從物體表面通過，與on有關(guān);
through穿過,即從物體內(nèi)部穿過，與in有關(guān)。
She swam across the river.
He walked through the forest.
4.表示“在……之間”的介詞：between, among
between指在兩個(gè)人或兩個(gè)事物之間;
among指在三個(gè)或三個(gè)以上的人或事物之間。
There is a football match between Class One and Class Two on the playground.
The teacher is standing among the students.
5.表示其他意義的介詞
1)on ,about 關(guān)于
on 表示這本書，這篇文章或演說是嚴(yán)肅的，或?qū)W術(shù)性的，可供專門研究這一問題的人閱讀;
about表示內(nèi)容較為普通，不那么正式。
There will be a lecture on economics this afternoon.
He is writing a book on cooking.
He told me a lot about his life in the summer vocation.
2)by, with, in 表示方法、手段、工具
by 以……方法、手段或泛指某種交通工具;
with 表示用 …工具、手段，一般接具體的工具和手段;
in 表示用…方式，用…語言(語調(diào)、筆墨、顏色)等;
He makes a living by selling newspapers.
He broke the window with a stone.
