恳请高手给予英语语法分析,1.万一发生什么不正常情况,立即关掉电源 (power supply).参考译文：Should

恳请高手给予英语语法分析,
1.万一发生什么不正常情况,立即关掉电源 (power supply).
参考译文：Should anything abnormal happen,switch off the power supply immediately.
错误译文：In case of something abnormal occurring,turn off the power supply.
2.我们只需要确定到底在什么条件下该方程成立.
参考译文：All we need to do is (to) determine under what conditions it is that the equation holds
错误译文：We only need to confirm in which case,the equation shall establish.
3.锡(tin)的熔点 (melting point) 没有铅的高.(使用“主+谓+宾”和 “as…as”句型)
参考译文：Tin does not have as high a melting point as lead (does).
错误译文：The melting point of tin is not as high as lead.
为此，需要把一切情况都考虑进去，(使用简单句)
参考译文：To do this,it is necessary to take everything into account,a very complicated procedure.
错误译文：Therefore,all cases needed to be considered.It is a very complicated procedure.