The higher density of the foam is the better. Check the foam particle frequently, if its size is not uniform, maybe some problems happened, e. g., jam in the pipe, leakage or mechanical trouble.

发泡时泡沫颗粒应愈绵密愈好，应随时注意发泡颗粒是否大小均匀，反之，必有发泡管阻塞、漏气或故障。

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Countercurrent type separators not suitable for dealing with coarse grained ores, because the magnetic particles size thick, easy to jam sorting sedimentary space.

逆流型磁选机不适宜处理粗粒矿石，因为粒度粗，矿粒易沉积从而堵塞选别空间。

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Because of the tiny size, however, we had to jam them oddly far into our ear canals to get a tight seal no matter which tips we used (single and dual-flange options are offered).

ENGADGET: Ears-on with Klipsch's latest intra-aural headphone lineup: Image S4 (II) series, X7i

The countermove the Pentagon has on order requires affixing under each chopper a 50-pound basketball-size turret that uses a low-power laser to jam and deflect incoming missiles.

FORBES: Light Warfare