把胶卷盒放入胶卷盒腔，拉出胶卷的牵引头，使牵引头超出牵引头标志。
Load the film cassette into the film chamber and pull out the film leader so that it extends past the film leader index.
有时，可以取用比胶卷盒上规定数值更大的曝光量，但是这些过量的曝光可能过大或拍坏。
It is sometimes possible to take more exposures than the specified number indicated on the box of the film. However, these "extra" exposures may be overlapped or cut off.
有时，可以取用比胶卷盒上规定数值更大的曝光量，但是这些过量的曝光可能过大或拍坏。
It is sometimes possible to take more exposures than the specified number indicated on the box of the film. However, these "extra" exposures may be overlapped or cut off.
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