Abstract: Ultrasound is widely used in engineering and biology for applications such as ultrasonic cleaning, cutting, and cancer treatment. Piezoelectric ultrasonic transducers are widely used to ...

第一次做某事总是困难的。尤其是在协作时，犯错误并不是一件舒服的事。但开源的本质就是协作与共同进步。我们希望简化新手学习与第一次参与开源项目的过程。 阅读文章和观看教程是有帮助的，但没有什么比“亲手实践又不会搞砸项目”更好的学习方式了。

On March 16, President Trump signed an executive order convening a task force on fraud, potentially signaling further efforts by the Administration to block and impede assistance for food, health care ...