The sealed bearings can be used as direct replacements for existing openbearing equivalents, enabling applications to be upgraded simply and cost-effectively.
这个密封的轴承可用于直接替换现有的开放式轴承当量，使应用软件升级简单和成本效益。
2
The most common approach to extracting metal-bearing ore from a porphyry copper deposit is by open-pit mining, although such mines also typically include some underground activities.
从斑岩含铜矿床开采含金属的矿石，最主要的方式是露天开采，尽管这种矿床常会伴随一些地下的地质活动。
3
Pulley is the key to open and close the Ji'nan guardrail is not smooth, the use of rolling bearing nylon wheel.