例句與造句

1. They are popular in South Africa for their beauty and their usefulness in wildlife gardens for attracting birds and useful insects.
2. DEET is the most useful insect repellent, though may not prevent bites if the yellow flies are in large numbers.
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. 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.
5. 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.
6. It's difficult to find useful insect in a sentence. 用useful insect造句挺難的
7. 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.
8. 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.
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. We have also here accounts of the advantages of cultivating Horse-hoe, Mr . Comber's Cutting-box, Mr . Clarke's Draining-plough, Mr . Ogden's Fallow-cleansing Machine, Mr . Randall's Spiky Roller, etc . etc . Under the article Bee, the authors have given a very full account of that laborious and useful insect, together with all the improvements that have been made with regard to the management of Bees, and the methods of taking the wax and honey without destroying them, according to the practice off White; Thorley, and Wildman.