This includes theproper surface support such as dive flags, buoys and lightsas appropriate.

这包括水面上的潜水旗、浮标和适当的灯光。

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This is the mechanical type of communication, which includes the use of signal flags, the 21-gun salute, horns, and sirens.

这是一种机械式的传播，包含信号旗、21响礼炮、号角、汽笛。

youdao

This is the mechanical type of communication, which includes the use of signal flags, the 21-gun salute, horns, and sirens.

这是一种机械式的传播，包含信号旗、21响礼炮、号角、汽笛。

youdao