When SBIOS finishes POST, it tells driver by writing an register.
直接翻譯：當系統(tǒng)SBIOS 完成提供開機實時測試(Power On Self Test)時,系統(tǒng)SBIOS 就會通過寫入登記/注冊來通知驅(qū)動器.
你的意思是（按照你對原文的理解）把【“,“當sbios完成post自檢后,sbios通過寫一個寄存器告訴驅(qū)動”這個方案比較好”】這句話翻譯成英語.
好吧,應(yīng)該是：
When SBIOS finishes POST, it tells driver by writing an register, which is a good solution .

說明：至于什么時候用that從句是根據(jù)句子上下文之間的關(guān)系來確定的,不是非得根據(jù)語法去生搬硬套的,套好了可以“拿來主義”,否則,顧此失彼啊. 如果一定要用that從句,那么就可能需要改變原文結(jié)構(gòu),寫成： that SBIOS tells driver by writing an register after finishing POST should be a better solution .
或者：it is a good solution that SBIOS tells driver by writing an register after finishing POST .