例句與造句

1. DEET is the most useful insect repellent, though may not prevent bites if the yellow flies are in large numbers.
2. They are popular in South Africa for their beauty and their usefulness in wildlife gardens for attracting birds and useful insects.
3. It also advocates training farmers to identify friendly insects that can help fight harmful ones and to use insecticides without destroying useful insects.
4. The majority of coccinellid species are generally considered useful insects, because many species prey on herbivorous homopterans such as aphids or scale insects, which are agricultural pests.
5. Conversely, certain tachinid flies that prey on useful insects are themselves considered as pests; they can present troublesome problems in the sericulture industry by attacking silkworm larvae.
6. It's difficult to find useful insects in a sentence. 用useful insects造句挺難的
7. Focusing on the biological control of insects that were harmful to the sugarcane industry, he traveled extensively looking for useful insects in Australia, Ceylon, China, Japan, Fiji, and Mexico.
8. Prime Minister Khaleda Zia on Tuesday ordered air force helicopters to start spraying insecticides despite concerns that the chemicals could harm plants and useful insects, the Daily Star and Janakantha newspapers reported.
9. These and other useful insects are discussed in detail in the 63-page color booklet, which is available by mail for $ 22.50 from Cornell University, Media Services Resource Center, 7BTP, Ithaca, N . Y . 14850.
10. These and other useful insects are discussed in detail in the 63-page color booklet, which is available by mail for $ 22 . 50 from Cornell University, Media Services Resource Center, 7BTP, Ithaca, N . Y . 14850.