Marginal有2個(gè)很常見(jiàn)的意思.
small and not important 小的;微不足道的;不重要的
a marginal improvement in weather conditions 天氣條件的略微好轉(zhuǎn)
The story will only be of marginal interest to our readers. 我們的讀者對(duì)這則故事不會(huì)很感興趣。

not part of a main or important group or situation 非主體的;邊緣的
marginal groups in society 社會(huì)中的非主流群體

hillside就是小山坡的意思.
Our hotel was on the hillside overlooking the lake.
我們的旅館位于可俯瞰湖水的小山坡上.

Rainfall就是降雨量的意思.
There has been below average rainfall this month.
這個(gè)月的降雨低于平均降雨量.

In any case的意思就是: whatever happens or may have happened 無(wú)論如何;不管怎樣
There's no point complaining now─we're leaving tomorrow in any case.
現(xiàn)在抱怨毫無(wú)意義,反正我們明天就要離開(kāi)了.

Either way, it is important to establish good ground cover to avoid the loss of soil through erosion.
either way; one way or the other
used to say that it does not matter which one of two possibilities happens, is chosen or is true兩者都一樣
Was it his fault or not? Either way, an explanation is due.
是他的錯(cuò)不是?無(wú)論是不是,都得有個(gè)解釋.
We could meet today or tomorrow─I don't mind one way or the other.
我們可以在今天或明天見(jiàn)面,哪一天對(duì)我都行.

Erosion就是侵蝕,腐蝕的意思.
Soil erosion by rain and wind is a serious problem here.
雨和風(fēng)對(duì)土壤的侵蝕在這兒是個(gè)嚴(yán)重問(wèn)題.

動(dòng)詞的形式是erode,那么這個(gè)單詞的本意就是" 侵蝕;腐蝕;風(fēng)化".
The cliff face has been steadily eroded by the sea.
峭壁表面逐漸被海水侵蝕.
The rocks have eroded away over time.
這些巖石隨著時(shí)間的推移逐漸風(fēng)化了.

還有一個(gè)引申義: to gradually destroy sth or make it weaker over a period of time; to be destroyed or made weaker in this way 逐漸毀壞;削弱;損害 written often passive ~ (sth) (away)
Her confidence has been slowly eroded by repeated failures. 她的自信心因?qū)覍沂÷サ袅?
Mortgage payments have been eroded(= decreased in value)by inflation. 償還的按揭貸款因通貨膨脹而降值.