This is also known as "hedging" or "single lock" - the same account opened in the same position more than a single and an empty one.
这也被成为“对冲”或者“锁单”——在同一账户里开设相同头寸的多单和空单。
Take note: respectively on tile and center position, the four corners of the voice of the free is an empty drum.
要注意：分别敲击瓷砖的四角和中心位置，声音空空的就是有空鼓。
Take note: respectively on tile and center position, the four corners of the voice of the free is an empty drum.
要注意：分别敲击瓷砖的四角和中心位置，声音空空的就是有空鼓。
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