又名羅剎 Also Called The Rakshasi
樵子笑道：「這芭蕉洞雖有，卻無個鐵扇仙，只有個鐵扇公主，又名羅剎女。」行者道：「人言他有一柄芭蕉扇，能熄得火焰山，敢是他麼？」樵子道：「正是，正是。這聖賢有這件寶貝，善能熄火，保護那方人家，故此稱為鐵扇仙。我這裡人家用不著他，只知他叫做羅剎女，乃大力牛魔王妻也。」樵子笑道：「这芭蕉洞虽有，却无个铁扇仙，只有个铁扇公主，又名罗刹女。」行者道：「人言他有一柄芭蕉扇，能熄得火焰山，敢是他么？」樵子道：「正是，正是。这圣贤有这件宝贝，善能熄火，保护那方人家，故此称为铁扇仙。我这里人家用不着他，只知他叫做罗刹女，乃大力牛魔王妻也。」
逐句解 Line by line
The woodcutter laughed and said, 'There is a Banana-Leaf Cave right enough, but there is no Iron-Fan Immortal — only an Iron-Fan Princess, who goes also by the name of the Rākṣasī.'
The correction, and with it the chapter's real subject. 剎 is chà, not the shā a dictionary would offer by default: the character is being used for its sound, to write the Sanskrit in 羅剎 (rākṣasa) exactly as it does in 寶剎 (kṣetra, a temple precinct). This is the first of forty-one appearances in the chapter, every single one of them inside 羅剎. A rākṣasī is a female flesh-eating demon out of Indian myth.
Pilgrim said, 'People say she has a banana-leaf fan that can put out the Mountain of Flames. Would that be her?'
熄得 turns on whether the thing is possible, so 得 is the light toneless de. Pilgrim takes the correction without comment and simply asks whether the person he wants is the person just described.
The woodcutter said, 'Just so, just so. That holy personage has this treasure, and is skilled at quenching fire and protecting the people of those parts; and that is why she is called the Iron-Fan Immortal.'
稱為 takes 為 as the linking wéi. The woodcutter explains her title as a local courtesy earned by service: she is called an immortal because she puts out fires, not because she is one.
'We hereabouts have no use for her, and know her only as the Rākṣasī — the wife of the Bull Demon King of Great Strength.'
用不著, "to have no use for," takes 著 as zháo, the reading for hitting the mark. And 大力牛魔王 — the Bull Demon King of Great Strength — is named here for the first time in the chapter, tucked into a subordinate clause, as a scrap of local gossip about who is married to whom.
The correction is the point of the whole scene, and the woodcutter delivers it with a laugh. There is a Banana-Leaf Cave right enough, but no Iron-Fan Immortal — there is an Iron-Fan Princess, and her other name is the Rākṣasī. Two long stretches of careful information-gathering, and the central fact turns out to have been wrong from the start.
What has happened is that two descriptions of the same person have failed to meet. To the farmers she is a benevolent power who quenches fire and is worshipped every ten years with pigs and silk; the woodcutter, who lives on her mountain and has no use for her, knows her by the name her own kind would use. 羅剎 writes out the sound of rākṣasa, a flesh-eating demon of Indian myth, and the character 剎 will come back forty more times in this chapter without ever being explained again.
The clause that matters arrives as an afterthought: she is the wife of the Bull Demon King of Great Strength. Pilgrim swore brotherhood with that demon five hundred years ago and later subdued his son, the Red Boy, and handed him over to Guanyin. The woodcutter knows none of this and has no reason to. He is passing on village gossip about who is married to whom.
The chapter's whole engine is assembled in that subordinate clause. Everything before it has been a problem of geography — eight hundred lǐ of fire in the road — and everything after it will be a problem of grievance. The obstacle has just acquired a reason to say no.