Considering the signaling system project for Beijing subway Line 4 and its extension, two different implementation options are discussed.

针对北京地铁4号线及其延伸，讨论线路延伸工程中信号系统适用的两种实施方案。

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Key Pulsing is a method of signaling by depressing keys on a line otherwise arranged for rotary pulse dialing.

按键脉冲是通过在一条线上按键而不是旋转脉冲拨号的信令方法。

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AIM: to investigate the influence of TG-interacting factor (TGIF) on the retinoid signaling pathway in gastric cancer cell line SGC-7901 in vitro.

目的：探讨TG -相互作用因子(TGIF)对胃癌SGC - 7901细胞株中维甲酸信号通路的影响。

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If you start to cross the line without signaling, it triggers a warning.

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