Carnauba is the hardest natural occurring wax available.巴西棕榈是一种天然的最硬物质.He skirted the hardest issues, concentrating on areas of possible agreement...他避开了最棘手的问题，将精力集中于有可能达成一致的领域。Bridge design is probably the hardest brain...
It's easy to make a mistake .犯错误很容易。I'd always played a defensive game, waiting for my opponent to make a mistake.我总是采取防守型的打法，等待对手出错。Be careful or else you will make a mistake.小心,否则你会犯错误....