There are plenty of free versions of popular VPNs, and free trials of VPNs with full access to everything you get with a premium plan. The catch is that free versions usually come with limited data usage, meaning you can't really do any streaming or downloading. Free trials come with everything you get in a paid plan, but they obviously don't last very long. Trials are great for testing out a service before committing, but this isn't a long-term solution.
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做到实事求是，离不开调查研究这个基本功。
await blocking.writer.write(chunk5); // waits until consumer reads
Source: Computational Materials Science, Volume 267