Pick a pack that its size is suitable for the wearer's body.

选择一个符合使用者体型的背包。

youdao

Make sure the pack fits properly and its size is suitable for the wearer's body.

确保背包尺寸合适，大小和使用者的体型相符。

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It was the size of a pack of cigarettes, gleaming in white and polished stainless steel and ready to swallow hundreds of songs.

它有香烟盒大小，白色精制的不锈钢熠熠发光，随时准备吞下几百首歌曲。

youdao

Before my serendipitous encounter, I had my eye on the Motorola 89442N Universal External Cell Phone Battery, a pack about the size of a phone with a bantam micro-USB arm.

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Ting Xu, a professor at the University of California, Berkeley and Thomas Russell, a professor at the University of Massachusetts at Amherst, have created a technique that could, theoretically, pack a disk the size of a quarter with 10.5 terabits (more than 10 trillion bits) of data, the equivalent of 250 DVDs.

FORBES: Magazine Article

The M500 is right about in the middle of the pack for size and weight.

ENGADGET: Review of Motorola's 5GB M500 MP3 player