1
a/an + grand piano
表示不定指，泛指一架三角钢琴。
They bought a grand piano for the concert hall.
他们为音乐厅买了一架三角钢琴。
三角钢琴；大钢琴
先理解核心含义，再看它在真实句子里的用法。
三角钢琴；大钢琴
a large piano with horizontal strings and a wing-shaped case
They bought a grand piano for the concert hall.
他们为音乐厅买了一架三角钢琴。
一种大型钢琴,琴弦水平张设在形似竖琴的重型框架内。
A large piano in which the strings are strung horizontally in a heavy frame shaped like a harp.
The hotel lobby has a beautiful grand piano near the window.
酒店大堂在窗户附近有一架漂亮的三角钢琴。
She practiced her recital piece on the grand piano every afternoon.
她每天下午在大钢琴上练习她的独奏曲目。
The music store sells both upright pianos and grand pianos.
这家乐器店出售立式钢琴和三角钢琴。
表示不定指，泛指一架三角钢琴。
They bought a grand piano for the concert hall.
他们为音乐厅买了一架三角钢琴。
play后接乐器通常用the，但口语中也可省略。
She plays the grand piano beautifully.
她弹三角钢琴弹得很美。
表示位置或动作的起点。
The pianist sat at the grand piano.
钢琴家坐在三角钢琴前。
Not this
I bought grand piano.
Use this
I bought a grand piano.
英语中，可数名词单数前需加冠词。'grand piano' 为单数可数名词，泛指时需加不定冠词 'a'，特指时加 'the'。
Not this
She has two grand piano.
Use this
She has two grand pianos.
'grand piano' 的复数形式是 'grand pianos'，而非保留单数形式。名词复数需加 '-s'。
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Dictionary facts from ECDICT, WIKTIONARY.