只短暂出现
Appear only briefly
以上为机器翻译结果,长、整句建议使用 人工翻译 。
竹燕窝生长需要很高的生态环境要求,人工无法种植,且只出现于仲秋季节,周期短暂、产量极少。
Bamboo bird's nest's growth environment needs high ecological environment, not artificial planting. And it can only appear in half past autumn season, with low yield and short circle.
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