直接联结

例句：

1. 1. The two companies have been directly connecting for years.
   这两家公司已经直接合作了多年。
2. 2. Direct linking between the two systems is essential for smooth operation.
   两个系统之间的直接链接对于平稳运行至关重要。
3. 3. The researchers found a direct link between the genetics and the disease.
   研究人员发现基因和疾病之间存在直接联系。