妳的意思是不是有什麽特殊的語境啊？能否說明？
rotation指的是循環 旋轉，而pitch 的用法意義很多，有音調、理清、投擲等待很多意思，具體什麽時候使用pitch還得看具體的語境！！，，，。。。。。
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rotation
名詞 n. [U][C]
1.旋轉;天自轉
The sun appears to rise and set because of the earth's rotation.
因為地球在自轉,看上去就有了日出和日落。
2.循環;輪流,交替;(農作物的)輪作
the rotation of kitchen
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pitch1
及物動詞 vt.
1.搭(帳篷);紮(營)
The boys pitched a tent by the river.
男孩子們在河邊搭起了帳蓬。
2.把...定得,把...定在[O]
The prices of these cars are pitched extremely competitively.
這些汽車的售價定得極有競爭性。
3.音為...定音高;為...定調[O]
The song is pitched too high for my voice.
這首歌的起音太高了,我唱不上去。
4.帶著特定感情說(或寫)[O]
He pitched his story in a sentimental strain.
他把故事寫得帶有傷感情調。
5.投,擲,扔
She pitched the ball as far as she could.
她盡力把球投得遠壹些。
6.使向前(或向下)跌倒,使向外摔出[O]
The carriage overturned and the passengers were pitched out.
車子翻了,乘客們被摔了出來。
7.美俚竭力推銷
The salesman stood at the door, pitching his products.
推銷員站在門口,極力推銷他的產品。
8.主英俚講述
不及物動詞 vi.
1.搭帳篷;安營
They pitched up for the night.
他們紮營過夜。
2.投擲
He nearly always pitches too far.
他幾乎總是投得過遠。
3.向前跌;猛然摔倒;向外摔出[Q]
The fisherman lost his balance and pitched into the sea.
漁夫失去了平衡,壹頭栽進海裏。
4.(地面,道路等)傾斜[Q]
The roof of the house pitched at a 45°angle.
屋頂傾斜四十五度。
5.(船只等)前後顛簸,搖晃
Our ship pitched about in the storm.
我們的船在暴風雨中顛簸。
名詞 n.
1.投;投球[C]
2.語音音高[C]
Her voice dropped to a lower pitch.
她的聲調低了下來。
3.程度;高度;強度[U][S1][(+of)]
The children were in a high pitch of excitement.
孩子們高度興奮。
4.(船等)前後顛簸[U][the S]
5.(屋頂等的)傾斜度,坡度[U][the S]
The roof has a steep pitch.
屋頂很陡。
6.口叫賣,推銷[C]
7.美俚情況,現狀[the S]
pitch2
名詞 n. [U]
1.瀝青
The room was as dark as pitch.
房間裏漆黑壹團。
2.樹脂,松脂
及物動詞 vt.
1.用瀝青塗