expert

He considers himself an expert.

他认为自己是专家。

It is true by using an expert's words.

用专家的话来说是真的。

Charles Boutron is an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France.

查尔斯·布特隆是法国国家科学研究中心的一名专家，研究重金属对环境影响。

The Japanese are expert at lowering manufacturing costs.

日本人在降低生产成本方面很在行。

Each jump required careful planning and expert timing.

每一次跳跃都需要周密的计划和专业的节奏把控。

To find out what the weather is going to be, most people go straight to the radio, television, or newspaper, to get an expert weather forecast.

为了了解天气情况，大多数人会直接通过广播、电视或报纸来获得专业的天气预报。