It relies on a series of cameras and ultra-sound radar sensors that ensure the car stays in lane and is a safe distance from other cars.

依靠一系列的摄像机和超声雷达感应器，汽车能够确保在车道内行驶，并与其他车辆保持安全距离。

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Unlike high altitude aircraft, helicopters aren't so vulnerable to being seen by radar, as they fly low and are often hidden by the terrain. The big issue is the sound.

与在高空飞行的飞机不同，直升机不容易被雷达发现，因为它的飞行高度较低，且常常被地形所隐藏，因此最大的问题是噪音。

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Call me when the fog set in. Sound regulation whistle, attend to echo sounding and start radar at an interval not more than 20 minutes.

下雾时要叫我，鸣放汽笛，动用测深仪，启动一次雷达不要超过20分钟。

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An editorial in Beijing's Global Times says Japan has highlighted the radar incident "to sound an alert" between the Chinese and Japanese public.

BBC: Japan Maritime Self-Defense Force destroyer Yuudachi

Elliptic's ultrasound technology uses sound waves and microphones to detect movement, similar to how radar detects objects.

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