The -s switch specifies that only the synchronous (blocking) methods will be available.

s开关指定只有同步(块)方法可用。

youdao

Reverse blocking tetrode thyristor; semiconductor controlled switch.

反向阻断四极型可控硅、半导体控制开关。

youdao

A new type of hydraulic control switch with circular adjustment for blocking water in oil well is developed.

研制了一种新型液压控制可循环调层的堵水开关。

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If it happens, this switch to net importer will be a sign that Beijing's export-blocking strategy of "encouraging" foreign manufacturers to locate plants in China (for want of available and affordable rare earths anywhere else) is working.

WSJ: Business Asia: Postcards From the Rare-Earth Front

In a curious way, at a macro-geopolitical level, we are seeing a resurgence of a broad East-West competition, with the Russians -- stung by what they view as the West's "bait and switch" U.N. resolution authorizing action in Libya -- joining the Chinese in blocking meaningful action through the United Nations.

CNN: After the fall of the House of Assad, could Syria be worse?