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They are characterized by having cell walls made chiefly of chitin, not the cellulose of plant cell walls, and they all develop directly from spores without an embryo stage.
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其特征如下：细胞壁主要由几丁质构成，而不完全是植物细胞壁中的纤维素。 |
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They are characterized by high carbon dioxide compensation points owing to PHOTORESPIRATION.
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它们光呼吸很明显因而具有较高的二氧化碳补偿点。 |
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They are characterized with systematization and generalization, which result from their semantic association and their formative analogy.
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它们以扩散性的联想意义为联结而进行语义泛化或结构类推成词，并具有系统性、对举性、概括性特征。 |
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They are cheering us on.
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他们正在为我们加油打气呢。 |
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They are chiefly of Jewish parentage.
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他们大体上有犹太血统。 |
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They are children and while away from home, they can't help but often think of their parents and other relatives.
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他们是孩子，所以当离开家的时候，他们忍不住要想念他们的父母亲和亲戚。 |
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They are classified as intercontinental, long-range, medium-range and short-range missiles.
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它们分别为洲际导弹、远程导弹、中程导弹、近程导弹。 |
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They are classified as to new and old world, and from different places on Earth.
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他们被以新的和旧的世界，以及从地球上的不同地方来归类。 |
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They are classified into 6 ecological types: Terrestrial ferns, Tree ferns, Epiphytic ferns, Vine ferns, Aquatic ferns and Rock ferns according to their growth localities.
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蕨类植物按生长的地理位置可分为陆生蕨类、树蕨类、附生蕨类、藤本蕨类、水生蕨类、石生蕨类。 |
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They are cleaning their classroom.
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他们正在打扫他们的教室。 |
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They are clearing away debris littering the seabed - all carried by the killer tsunami two weeks ago.
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如今，潜水员的工作是清除两个星期前被猛烈的海啸卷入海底的废墟杂物。 |
