The trade wind is a kind of natural cold source in spring, autumn and winter.
新风在春、秋、冬季是一种天然的冷源。
Another kind is a factor of other source, namely others' appraisal and attitude.
另一类是外源因素，即他人的评价与态度。
Chicken skeleton was one kind of cheap and rich organic source of calcium.
鸡骨架是廉价而丰富的有机钙源。
Chicken skeleton was one kind of cheap and rich organic source of calcium.
鸡骨架是廉价而丰富的有机钙源。
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