该机种的技术和重量问题一直是困扰项目的主要原因。
It has been the main cause of the technical and weight problems that have bedevilled the programme.
289克的重量并不笨重，但因为什么原因它要比看上去重一些。
At 289 grams it isn't hefty but for some reason it feels heavier than it looks.
你也可以因其他原因获得更多的重量，如增加肌肉，但是你得积极一些，沉重的训练及多吃。
You can also gain more weight for other reasons such as increased muscle, but you would need to be doing progressive, heavy resistance training and eating more calories over time.
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