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冰河水心
the experience of train/work 培训/ 工作经历intention of job 求职意向
滋味游龙
He must be professionally trained(接受过职业化的培训)He must be specially trained 也可以
朝天辣椒smile
He must have been trained specially.一方面强调对现在造成的影响，所以用现在完成时；另一方面，表示语气较为肯定的推测，所以用must
jhaiyun888
He must be trained specifically.
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