观景式相机
答:观景式相机,是指由前方镜头版、后方对焦板及连接二者的风琴箱组成的照相机。观景式相机的镜头版和对焦版可以随意移动,改变画面焦点和透视关系。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
The speaker smiled broadly so we wouldn't see his ( ).(nervous)