...a thin tube-like optical instrument.

试管状的细长光学仪器

...instruments for cleaning and polishing teeth.

清洗和抛光牙齿的器械

The environment itself will at the same time be measured by about 60 scientific instruments.

同时环境本身将由大约60种科学器械来测量。

Learning a musical instrument introduces a child to an understanding of music.

学一门乐器能引导孩子了解音乐。

...crucial instruments on the control panel.

控制面板上的重要仪表

...navigation instruments.

导航仪器

The veto has been a traditional instrument of diplomacy for centuries. [+ of]

几个世纪以来否决权一直是外交上惯用的手段。