turndown
adj. 翻领的；可翻下的；折叠的；衰退的，下降的
n. 翻领；拒绝；低落；萧条
例句
Offers opened turndown service.
为客人提供开夜床服务。
Does turndown service when required.
需要时提供开夜床服务。
The results show that valve-sieve compound trays have smaller turndown ratio and smaller capacity.
试验结果表明：浮阀筛孔复合塔板操作弹性小、气液处理量小；
