新例句确保了所有指定单词（`engineering`, `medicine`, `gravitate`）均以其原形出现，同时完整保留了原句的核心语义、正式风格和近似长度。

，您好。根据您的要求，我已对原句进行了分析和重写。

金山词霸

He is deeply acquainted with the literature of France, Germany, and Holland.

他对法国、德国和荷兰的文学十分熟悉。

金山词霸

What effect will the alliance between IBM and Apple have?

IBM和苹果公司之间的联盟会有什么效果？

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You can chat with friends who are online.

你可以和在线的朋友聊天。

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The mathematics and language testing presents an unusually difficult challenge.

数学和语言测试带来了异常困难的挑战。

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Income taxes are now levied separately on husbands and wives.

现在对丈夫和妻子的收入分别征税。

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The commander and several soldiers had been freed.

指挥官和几名士兵已获释。

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Fast food chains and megamalls are commonly found along the highway system.

公路系统沿线常见快餐连锁店和大型商场。

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Currently, 30 percent of reptile, bird, and fish species are at risk of extinction.

目前，30%的爬行动物、鸟类和鱼类物种面临灭绝的风险。

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The rescue team had to withdraw due to the relentless winds and towering waves.

救援队不得不撤退，因为遭遇了持续不断的狂风和滔天巨浪。

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His remedial teacher sees a clear sign of progress in both his writing and reading.

他的辅导教师认为他的写作和阅读都显示出明显的进步迹象。

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My fingernails have a ragged appearance, with split cuticles and bitten edges, resulting in an irregular nail length.

我的指甲呈现出粗糙的外观，有裂开的表皮和被咬过的边缘，导致指甲长度不一。

金山词霸

Add a pinch of black pepper, salt, and cayenne to the dish.

在菜肴中加入少许黑胡椒、盐和辣椒。

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Fresh fruits, whole grains, and bran are essential, and so is regular exercise.

新鲜的水果、全谷物和麸皮很重要，定期锻炼也是。

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The members on the floor continued their relentless jeering and obstructive acts of interruption.

议员席上的成员们继续着他们无休止的嘲讽和蓄意阻挠的打断行为。

金山词霸