我就问钟博：现在瓣膜治疗还有哪些关键问题没解决？核心还是落到需求。主要是两个问题：一是植入后生物兼容性，二是寿命。那解决这两个问题靠什么？材料。
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\{x_0 \dots x_{n-1}\}. If we continue this process by induction,
"I want to make it clear to those who are trying to take money from the plane involved in this tragedy that this money has no legal value since it has not been issued by the Central Bank and does not have a serial number, and that attempting to use this money is a crime," the Minister of Defence, Marcelo Salinas, said.