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Inside is a purple-brown shiny seed,2-3 cm long by about 2 cm across. 句中的by about 2 cm across的意思是呢？谢谢回答。
介词by在这里表示测量长宽时的大小，如：
The photographs should measure 3 cm by2 cm. 照片尺寸应为3厘米x 2厘米。
It measures 15 cm long by 12 cm wide. 经测量，它长15厘米，宽12厘米。
I need a piece of clear glass 22 cm by35 cm. 我要一块长35厘米宽22厘米的透明玻璃。
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