Place the tennis balls on the ground and then lie on them in the supine position (lying down face-up), keeping the knees bent.
把网球放在地上然后以仰卧位面朝上躺下、屈膝位躺在网球上。
You can easily find readability by a poster on the corkboard, a clock face and letters on the tennis balls.
你可以轻松的利用公告板、时钟和有字母的网球海报来确定画面的可读性。
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