If your subject is not in the center of the picture, you need to lock the focus to create a sharp picture.
假若你的拍摄对象不是在照片中央，你就需要锁定焦点已获得清晰的相片。
The TV picture is not very sharp.
电视图像不太清晰。
The TV picture isn't very sharp.
电视图像不太清晰。
There is something wrong with our TV. The picture is not very sharp.
我们的电视机有问题，图像不是很清晰。
There is something wrong with our TV. The picture is not very sharp.
我们的电视机有问题，图像不是很清晰。
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