The evolution of the frontal appendage is an important event for the early arthropods to improve their feeling and feeding ability under the fiercely 'arm race' press in Cambrian explosion.

在节肢动物早期演化阶段，前附肢的演化是提高动物感觉和捕食能力的重要事件。

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Another used what little was left of his right arm to race up a rock-climbing wall.

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He said friends had held race nights and sold arm bands at local shops.

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Without some shot in the arm like that, CNG is likely to lose the race to electrification.

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