未生锈的

6 As for all machined surfaces without protective paint, metal protector or grease should be applied to avoid serious rustiness.

6对于所有机械加工的未涂防护漆的表面，应涂上金属防护剂或油脂，以防严重生锈。

Like former battlefields all over the world, the southern Japan island of Okinawa - home to more than 1 million people and the site of some of World War II's most savage fighting - is a tinderbox of unexploded bombs, thousands and thousands of tons of them, rusted and often half buried.

日本南部的冲绳岛居民超过1百万，二次世界大战期间，此地曾发生过最猛烈的几场战役；和全世界其他以前曾是战区的地方一样，冲绳岛就像一个装满未爆弹的易燃物，炸弹数量有几千几万吨，都已经生锈，而且通常半埋在土中。

In the Delta town of Rome (population: not listed on the census website; churches: four), homes are modest, sometimes tumbledown, cars rust in backyards and the steadiest jobs are at a nearby jail.

在三角洲地区的罗玛（人口未被统计，共有四所教堂），这里住户生活困难，有时甚至面临破败危险，通常汽车都会在后院生锈，而对于当地人来说，最稳定的工作就是附近的一所监狱。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。