请问una corda 是什么意思？

踩下左踏板

una corda 踩下左踏板。
tre corda 踩下右踏板。
con pedale 是用踏板
senza pedale 是不用踏板

una corda〔意〕（原意：一根弦）（1）在一根弦上演奏（弦乐器）。（2）用弱音踏板，参见tre corde
una corda :
The soft pedal (or una corda pedal) is one of the standard pedals on a piano, generally placed leftmost among the pedals. On a grand piano, this pedal shifts the whole action including the keyboard slightly to the right, so that hammers that normally strike all three of the strings for a note strike only two of them. This softens the note and also modifies its tone quality.

una corda 踩弱音踏板，
tre corda 放弱音踏板

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