它只偶尔出现，一生一次吧，我想。
That only comes once in a while, once in a lifetime, I think.
为完成此类活动，被训练的动物只偶尔喂点水，完全没有食物。
Training for these events is accomplished by withholding food and sometimes water.
后由于工作上的缘故，较少参与美术业界活动，只偶尔在艺术摄影方面与外界作些交流。
Because of the sake of work after, less involved in fine arts industry activity, only occasionally in art photography and outside make some exchanges.
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