Conclusion The anterior operation has a significant effect on OPLL, which could resect the ossific tissue directly, decompress the spinal cord completely, and fix the vertebrae firmly.
结论 OPLL经颈前路手术可直接切除致压物，减压彻底，钛板固定可靠，手术效果良好，但手术风险及合并症高于后路手术。
OPLL
英语例句库
英语百科
Yamaha YM2413
（重定向自OPLL）
The YM2413, aka OPLL, is a cost-reduced FM synthesis sound chip manufactured by Yamaha Corporation and based on their YM3812 (OPL2). To make the chip cheaper to manufacture, many of the internal registers were removed. The result of this is that the YM2413 can only play one user-defined instrument at a time; the other 15 instrument settings are hard-coded and cannot be altered by the user. There were other cost-cutting modifications: the number of waveforms was reduced to two, and the channels are not mixed using an adder; instead, the chip's DAC uses time-division multiplexing to play short segments of each channel in sequence, as also done in the YM2612.
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