It points out that, due to the restrictions of policy and its characteristics, it will be very hard for a metro company to make profit simply from metro operation.

地铁公司由于受政策和自身特点等方面的限制，单靠自身的经营很难实现盈利。

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The lever type differential adjustment can be made by hand or by foot to make the operation simply and freely. it is capable for sewing various flexible fabrics.

杠杆式差动调节，即可手动又可脚动，使操作变的简单自如，最适合伸缩面料的各种缝制要求。

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