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乐高 EV3 实验03 - 接触传感器，撞到就停 · App Inventor 2 中文网
...，撞到就停
第 3 步：撞到后自动后退
第 4 步：停止与收尾
四、排错表
五、下一步
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实验03：接触传感器，撞到就停
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bobincebobince
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What is the use of static constructors?
...omplicated (see "beforefieldinit"), and changed subtly between CLR2 and CLR4). Unless you abuse reflection, it is guaranteed to run at most once (even if two threads arrive at the same time).
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Answered my own question. Sigh
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