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。
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。
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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