[dào dǐ]
(到尽头) to the end; to the finish
									
										fight to the finish
										打到底
									
									
									
										hold on to [till] end
										坚持到底
									
									
									
										The experiment finally proved to be a success.
										试验到底成功了。
									
									
									
										What on earth did you say?
										你到底说了些什么?
									
									
									
										Don't get discouraged, you are new to the work after all.
										别灰心, 这工作对你说来到底还是生疏的。