YOU SAID:
She sold seashells by the seashore.
INTO JAPANESE
彼女は海岸で貝殻を販売しました。
BACK INTO ENGLISH
She sold the shells on the beach.
INTO JAPANESE
彼女は浜辺で貝を販売しました。
BACK INTO ENGLISH
She sold the shells on the beach.
That didn't even make that much sense in English.