Did not master essentials up to now, invaluably. 至今未掌握要领，无法评价。
In summary, manual testing fills a gap in the testing repertoire and adds invaluably to the software development process. 总而言之,手工测试弥补了测试一览表之间的空白,对软件开发过程增加了极大价值。
If we manage to exercise every day for a considerable period of time, the habit would contribute invaluably to our health. 如果我们坚持在一段时间里每天锻炼，这个习惯对于我们健康的贡献将是无价的。
