三弦的英文：
three-stringed

参考例句：

They were accompanied chiefly on the pipa, three-string and clappers.
他们的伴奏乐器主要有琵琶、三弦、板等

three是什么意思：
num. 三，三个

three coat,three bake
“三涂三烘” 工艺(反复涂三道漆，烘干三次的施工方法)

fiveteen contains five and three.
15可被5和3除尽。

To draw three feet of water
吃水三尺

It earned three Grammy Awards.
它赢得三项格莱美奖。

None of these three can be excluded.
这三者缺一不可。

stringed是什么意思：
n. 绳子；串线，串绳；一串，一行，一列；（乐器的）弦；（植物的）纤维，筋
v.（用线）穿，串起；缚，扎，挂；除去（植物的）筋；给…装弦

A string of accidents happened at that corner.
在那个转角发生了一连串的事故。

The parcel was tied with string.
这个包裹用绳子捆着。

These girls are stringing pearls.
这些女孩正在串珍珠。

She is stringing a parcel.
她在扎包裹。

I have a string of beads.
我有一串珠子。