If the vacuum near the cathode is too poor, it will generate spark, gas ionization and ion bombardment on cathode, which can result in a fast attenuation of the emission current.

如果碳纳米管阴极附近的真空度太低，将产生打火、气体电离、离子回轰阴极等问题，将导致阴极发射电流的迅速衰减。

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Tourism mand photography always generate spark together. Ye Wu, President of Jiale World Tourism Company of Netherlands, combined the two ingeniously and explored a splendid field.

旅游与摄影，总是相映生辉，荷兰嘉乐世界旅游公司的董事长叶武，将二者巧妙结合开拓出一片精彩天地。

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This may feel pretty foolish at first, but by repeating it several times a day, you'll consistently spark your nervous system to generate feelings of happiness, spontaneity, humor, and skillness.

开始会觉得相当傻气，但每天重复几次，你会不断的刺激你的神经系统，其间产生快乐、自然而然、幽默和愚蠢的感觉。

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By contrast, telling a story can spark the imagination and generate creativity, interaction and transformation.

FORBES: The Power of Scrum

Employees are urged to wander from floor to floor, bounce ideas off one another and test out new products in the hope that such informal interactions will help spark collaboration, solve problems and generate new ideas.

WSJ: Looking for Ideas in Shared Workspaces