贴图的最左端像素位置。

Left-most pixel position of the texture.

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在算术右移位运算中，将丢弃移出最右侧数位位置的数位，并将最左侧的数位传播到左端空出的数位位置。

In an arithmetic right shift, the bits shifted beyond the rightmost bit position are discarded, and the leftmost bit is propagated into the bit positions vacated at the left.

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在大多数情况下，转向盘转三到四周方能使车轮从一个极限位置转到另一个极限位置（从最左转动最右）。

On most cars, it takes three to four complete revolutions of the steering wheel to make the wheels turn from lock to lock (from far left to far right).

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