Gloss on words in the passage 'Once or twice a minute all summer' -- Harry Potter Mainland Chinese translation.

哎呀,
Āiyā 'oh' 'oh, Percy'
珀西, Pòxī 'Percy'
你 nǐ 'you' 'so you are a Prefect!'
原来 yuánlái 'originally, it turns out that...' Used to express a realisation of facts or background information that the speaker did not know before
是 shì 'to be'
级长 jízhǎng 'class captain' = 'prefect'
呀 ya exclamatory particle
'Oh Percy, so you are a Prefect!'
 
孪生 luánshēng 'twin' One of the twin brothers
兄弟 xiōngdì 'brothers'
中 -zhōng 'among'
的 de connecting particle
一个 yíge 'one + classifier' (classifier 个 ge used for people)
用 yòng 'use, adopt; with' with a very surprised expression
非常 fēicháng 'very'
吃惊的 chījīng 'be surprised'
的 de connecting particle
口吻 kǒuwěn 'expression'
说 shuō 'to say' says
says one of the twins with a very surprised expression.
你 nǐ 'you' 'you should have told us earlier'
早 zǎo 'early, earlier'
该 gài 'should'
告诉 gàosu 'to tell'
我们 wǒmen 'us'
我 wǒ 'I' 'I didn't know at all'
一点都 yìdiǎn dōu 'at all'
不 bù 'not'
知道 zhīdào 'to know'
呢 ne sentence-ending particle
'You should have told us earlier. I didn't know at all.'
 
慢着 màn-zhe 'slowly; just a minute' 'just a minute'
我 wǒ 'I' 'I think'
想 xiǎng 'to think'
我 wǒ 'I' 'I remember'
记得 jìde 'to remember'
他 tā 'he' 'he mentioned (it)'
说过 shuō-guo 'to have said'. 过 guo is a verb-ending (or particle) that indicates occurrence in the past.
孪生 luánshēng 'twins' the other of the twin brothers
兄弟 xiōngdì- 'brothers'
中 zhōng 'amongst'
的 de connecting particle
另外 lìngwài 'other'
一个 yíge 'one + classifier' (classifier 个 ge used for people)
说 shuō 'to say' says
说过 shuō-guo 'to have said'. 过 guo is a verb-ending (or particle) that indicates occurrence in the past. '(he) mentioned (it) one time'
一次 yícì 'one time'
'Just a minute, I think I remember him mentioning it once'
 
说不定 shuōbudìng 'maybe' (literally, 'not say with certainty') 'maybe twice'
是 shì 'to be/is'
两次 liǎngcì 'two times'
'Maybe twice'
 
等 děng to wait' 'wait a minute'
一会儿 yìhuǐr 'a moment' or 'a while'
'Wait a minute'
 
说了 shuō le 'said' 'mentioned (it) all summer'
整整 zhěngzhěng 'entire'
一个 yíge 'one' + classifier (个 ge is a very general and versatile classifier)
夏天 xiàtian 'summer'
呢 ne sentence-ending particle
'He mentioned it all summer'
 
哎呀 āiyā   'oh, shutup'
住嘴 zhù zuǐ  
级长珀西 Jízhǎng Pòxī   Prefect Percy says
说 shuō  
'Oh shutup' says Percy Prefect

For the most part, Chinese word-for-word glosses make sense in English. The particle 的 de has been indicated as a 'connecting particle'. It is often used to indicate that a noun is modified by what goes before.

Another problem is sentence-ending particles, which have a force that cannot always be adequately conveyed in English.