Motherboard is the main computer circuit inside the PC, which holds the processor, memory and expansion slots, and connects directly or indirectly to every part of the PC.

主板是电脑中主要的电路板，其上安有处理器、内存和扩展槽，并直接或间接地与电脑各个部件相连。

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The 24-year-old ladies' world champion is the first woman to compete on the main circuit for 15 years.

现年24岁的女子世界冠军是15年来参与主要巡回赛的首位女性。

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If you see sparks or broken or frayed wires, or if you smell hot insulation, turn off the electricity at the main fuse box or circuit breaker.

如果你看到冒火花的、断裂的或者磨损的电线，或者闻到绝缘体烧焦的味道，在保险丝盒或者断路器断关闭电路。

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The devices are grey market add-ons that can be soldered to a console's main circuit board to bypass copyright controls.

BBC: Jail for seller of illegal Xbox chips

But he topped the second-tier Challenge Tour rankings last year with two victories and has now made his breakthrough on the main circuit.

BBC: SPORT | Golf | Warren breaks tour duck in Malmo

The Argentine is playing only his second season on the main European circuit after performing well on the Challenge Tour.

BBC: SPORT | Golf | Vancsik on track for Madeira win