Qiányèyíng shì shūcài shēngchǎn zhōng de zhòngyào hàichóng.
The leaf-miner fly is a serious pest in vegetable production.
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潜 ('submerge, go stealthy') + 叶 ('leaf') + 蝇 ('fly') — the fly whose young 'sneak inside a leaf'. The telltale serpentine 'mines' between the upper and lower leaf surfaces are the larval galleries.
