The first grate has double spherical nets with the same center and outside the second one there is a shield cylinder to make electron congregate.

它采用四极枪结构，两个栅极，第一栅极采用双层同心球面网，第二栅极外还添加了屏蔽筒。

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The second problem is that Venus exhibits a halo of light when it is seen just outside the Sun's disc.

第二个问题是，当金星在太阳圆盘外被观测到时，它会呈现出光晕。

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You also quickly learn to adapt and come up with creative solutions to the problems the painting presents, and thinking outside the box will become your second nature.

你也能快速学会适应，并想出创造性的办法来解决绘画中出现的问题，进而创造性思维会成为你的第二天性。

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In the middle of the night, Johnson rose unconscious from his hotel bed and climbed onto a ledge outside the second-floor window.

NEWYORKER: Betrayed

The two bombs, which exploded within a minute of each other, were planted in litter bins on Bridge Street, the first outside a Boots store and the second outside a McDonald's.

BBC: Johnathan Ball and Tim Parry

"He initially put one leg outside the crane, then he put the second leg outside the crane, " Lawrence said.

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