无论哪种方法既繁琐又不安全，且损坏原主干线整体机械强度，分线接点电阻大、可靠性差、易发热，很容易发生事故。
Both of them have trouble and insecurity, but also impairs the whole mechanical strength of trunk line, and results in large contact resistance of branch, weak reliability, easy heating and accident.
youdao