Because transfer 2 only USES a fence and transfer 3 doesn't specify any ordering at all, transfer 3 is free to float anywhere before the barrier (transfer 4).
The Representational State Transfer (REST) architectural style offers a low-barrier entry point for consuming Web services.
代表性状态 (REST) 体系结构样式提供了壁垒较低的使用 Web 服务门槛。
3
Intermolecular electron transfer, which is known to play usually a dominant role in photoelectric conversion processes, is regarded as an electronic intermolecular barrier penetration process.