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| 1. | To lengthen in duration;protract. |
| 延长增加持续时间；持久 |
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| 2. | lengthen or extend in duration or space. |
| 延长或者在持续时间或者空间上延伸。 |
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| 3. | show that ladder Rasching ring filler is low in pressure reduction and good in anti fouling, which can lengthen |
| 实践使用结果表明，阶梯拉西环填料的压降低、抗污堵性能好，可延长洗涤塔的运行周期。 |
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