fuse

高温使这两种金属熔合在一起。

The high temperature made the two metals ___fuse together.

电器短路时，保险丝会自动熔断以保护电路。

The ___fuse will melt automatically to protect the circuit when there's an electrical short.

工兵在安装炸药前必须先检查引信是否完好。

The engineer must check the ___fuse before installing the explosive.