相比去年的型号最大的缺点，至少在我的测试中，是播放控制方面。
The most significant drawback compared to last year’s model, at least in my testing, has to do with playback control.
测试对象是那些拥有型号为8110、8120和8130的美国黑莓手机用户。
The lucky guinea pigs are owners of the Blackberry Pearl 8110, 8120, and 8130 in the US.
但是，由于气缸的品种和型号繁多，利用传统的人工测试和辨识方法来测定气缸的爬行现象耗时费力，劳动强度大。
However, it is labourous and time-consuming to determine stick-slip using traditional tests and identification methods due to the variability of cylinder variety and type.
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