- 重点词汇
- 相关例句
The respiratory behaviors usually occur when they are in the middle of water.
母仔豚呼吸行为多发生在夹江中心水域。
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These two kinds of lesions usually occur within 3 months after birth.
婴儿湿疹和婴儿脂溢性皮炎好发于出生后3个月以内的婴儿,后者可能是由于母体雄性激素的影响。
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This class of problems usually occur in many scientific and engineering fields.
此类问题时常出现在许多科学与工程的研究领域内。
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