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The key of (Dagger-style) dependency injection is that you can only access certain dependencies in certain parts of the application, and how those dependencies are constructed is separated from their actual use. I like this so much I implemented it with Crystal macros.
，更多细节参见哔哩哔哩
Code dump for 2.16
“冲突持续”假设下，第二轮谁接棒？在“战争拖长、霍尔木兹海峡长期不畅”的情景假设下，除了已经明显涨价的甲醇、LPG、硫磺、国际尿素外，部分目前仅处于情绪预热或温和跟涨的品种，将逐步进入第二轮、更具结构性的涨价周期，典型代表是硫磺的二次冲击、聚烯烃系统抬升，以及乙二醇的成本托底与补涨机会。
The Pentagon announced its first 13 commitments in late 2024, and a few months later, shortly before President Trump’s Inauguration, published a list of 17 funds that had been added to the program in early 2025, including America’s Frontier Fund, which is backed by Eric Schmidt and Peter Thiel. The Department of Defense has since gone quiet on the program, however, not announcing any further commitments. The Department of Defense appears to have made five other VC fund commitments since 2025, though Fortune was not able to learn the details of the investments.