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Rubber ducks have long been popular bath-time toys for children. However, they may not be as innocent as they look. In fact, they harbor harmful bacteria that could spread diseases. A study by American and Swiss researchers examined the microbes present inside the yellow toys. The researchers found potentially pathogenic bacteria in four __1__ the five toys studied, including a bacterium often associated with infections that people acquire in hospitals.
The researchers noted that the composition of the material used in making the rubber ducks was a key factor. Certain materials release carbon, which feeds bacteria and __2__ their growth. More specifically, the research findings revealed a high concentration of bacteria and fungi, with up to 75 million cells per square centimeter __3__ inside the rubber ducks.

A beautiful woman walked by and disturbed Joe’s concentration.
一位美女走過,使喬分心。
The researchers did a study on population concentration.
這些研究人員作了一項有關人口集中的研究。
Six million Jews died in Nazi concentration camps during World War II.
二次大戰期間,有 6 百萬猶太人死於納粹集中營。
The concentration of sugar in the solution determines its sweetness.
溶液中糖的濃度決定了其甜度。
Most plants absorb minerals and essential nutrients directly from the soil as they grow.
大部分的植物在成長時,會直接從土壤吸收礦物質和必要的養分。
The nutrient value of fruits and vegetables is high; in contrast, it is low in desserts and junk food.
蔬果的營養價值很高,相反地,甜點和垃圾食物的營養價值很低。
You should have taken more appropriate measures at that time.
當時你應該採取更合適的措施才是。
Jeans are obviously not appropriate for such formal occasions.
這樣正式的場合顯然不適合穿著牛仔褲。
The government is going to appropriate $5 million for the project.
這項工程政府將撥款 5 百萬美元補助。
For the good of the patient, the doctor suggested that he take only fluids for 3 weeks after the operation.
為了病人好,醫師建議病人在手術過後 3 個星期都吃流質食物。
Tourists were warned against visiting that country because its political situation was still somewhat fluid.
遊客被警告避免至該國旅遊,因為該國的政治局勢仍有些不穩定。
Lung cancer is mostly associated with smoking.
肺癌大多與吸菸有關。
The stadium is very large and can hold up to 60,000 people.
那間體育館很寬敞,可容納多達六萬人。
You should always be aware of your surroundings.
你隨時要了解周遭的環境。
Mary was aware of Tom’s bad intentions, so she refused to go out with him.
瑪莉察覺出湯姆不懷好意,所以拒絕和他約會。
The government has taken measures to improve the nation's infrastructure.
政府已採取措施改善該國的基礎建設。