Proficiency in Professional Knowledge的意思|示意

能够熟练掌握专业知识 ...了保证游客安全 » In order to ensure the safety of tourists 能够熟练掌握专业知识 » Proficiency in Professional Knowledge 宁可慢些，不要太急而错误；宁可笨些，不要太巧而败事 » Rather slowly, not too fast and error; some rather stupid, do not b...

熟练掌握专业知识 熟练掌握相关知识 Mastering Knowledge 熟练掌握专业知识 Proficiency in professional knowledge ; Master professional knowledge 能够熟练掌握专业知识 Proficiency in Professional Knowledge ..