With the newest kind of surgery, doctors make a small cut in the patient's belly bottom(button). A camera is placed through the hole to help *(guide) the surgical instrument.

有了这种最新的手术，医生在病人的肚脐上开一个小口。一个照相机通过这个开口放进去帮助指导手术仪器。

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Essentially this instrument rotates and the object never hits the bottom.

基本上来说，这个仪器会旋转，这个物体永远不会触底。

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The system adopts CAN bus technology for distributed control of each module at bottom layer of the instrument, and implements automatic control according to the biological experimental procedures.

该系统利用CAN总线技术对仪器底层各个模块进行分布式控制，实现了按生物试验流程的自动控制。

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When Wall Street went into meltdown last fall, the bottom fell out of the exotic-instrument market, and many of Harvard's private-equity investments proved to be unsalable--that is, worthless, at least temporarily.

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