一只快乐的小鸟在一棵落叶松上歌唱，仅此而已。

A merry little bird was singing on a larch-tree, but nothing more.

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微微地松上翼线以准备下一个动作。

Slack slightly with the upper wing to prepare for the next input.

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海滩松上的树皮甲虫会有选择性地寄居在松树上，避开年轻健康的松树。

Bark beetles in lodgepole pine used to be more selective, leaving the younger and healthier trees alone.

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