猫眼光栏的方形光孔成象太大。
The quadratic aperture of the cat 's-eye diaphragm is imaged too large.
为了减小样品上的温度梯度，台体上的光孔直径只有2.5毫米。
To minimise the temperature gradient across the sample, the light aperture in the block is only2.5 mm?.
细支撑构件可以在光孔中轴向移 动，调节至适当的高度后，通过螺钉紧固住。
The thin supporting member can be axially moved in the unthreaded hole, and after being adjusted to an appropriate height, the thin supporting member is fixed by the bolt.
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