Joanna took the news about the rising in price of edible oil with a grain/pinch of salt.

[误译] Joanna 得到了食油和粒状食盐价格上涨的消息。

[原意] Joanna 对食油价格上涨的消息半信半疑。

[说明] with a grain/pinch of salt是习语，意为“半信半疑”，“可疑”。