空中英語教室 near miss

TECHNOLOGY

第二次汽車工業革命：自動駕駛汽車　WHO’S IN THE DRIVER’S SEAT?

各家企業競相開發自動駕駛汽車

The race is on for cars that drive themselves

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near miss 幾乎沒撞上

Grammar gym

Knowing when to brake and when to accelerate in such situations is hard enough for a human driver, let alone a robotic one.

let something/someone alone
to not bother something or someone
Just let him alone because he's having a bad day.

let alone something or some

not to mention

example:
The child can't even say his name, let alone tell someone where he lives.
Thelma was so sick. She couldn't even walk to her front door, let alone to the hospital.