任何需要提前规划好的减压站、或使用超过两种气体的气体混合物、或潜水深度超过40米、或需要潜入沉船或洞穴、或使用超过两个气瓶的潜水。技术潜水常使用经过混合制成的气体，非一般压缩空气为气源。
西恩渴望成为技术潜水员去探索水下洞穴和失事残骸，但是他仅仅在安全措施保护下下潜过20次。
Sean wanted to become a technicaldiver to explore caves and deep wrecks, but he barely had 20 divesunder his belt.
起初罗伯特不让他女儿去潜水，但最后他让步了，因为她对自己的技术很有信心。
At first Robert wouldn't let his daughter go diving, but eventually he gave in as she was so confident about her skills.
起初罗伯特不让女儿去潜水，但最后他让步了，因为她对自己的技术很有信心。
At first Robert wouldn't let his daughter go diving, but eventually he gave in as she was so confidence about her skills.
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