It was now official; I was free to roam the exhibits, attend tutorials and sessions, and join in the fun of learning and networking at OSCON.
现在它非常正式；我可以自由地参观展览，参加讲座和会议，以及参加OSCON有趣的学习和网络培训。
Not all now join in the euro, the Schengen passport-free zone or European defence.
目前并不是所有的国家都加入了欧元区，申根免护照旅行区，或欧洲防务集团。
Solders are the main join materials in the electronic - packaging and now lead-free solders are used in the electrical products on a large scale.
在电子封装中焊料是主要的连接材料，现在无铅焊料已经普及并大规模应用在实际电子产品中。
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