Nghĩa của từ pyrethrum bằng Tiếng Anh

noun
1
an aromatic plant of the daisy family, typically having feathery foliage and brightly colored flowers.
Not all herbs smell good - catmint, curry plant, pyrethrum , rue, santolina and tansy are all pretty pongy.

Đặt câu với từ "pyrethrum"

Dưới đây là những mẫu câu có chứa từ "pyrethrum", trong bộ từ điển Từ điển Tiếng Anh. Chúng ta có thể tham khảo những mẫu câu này để đặt câu trong tình huống cần đặt câu với từ pyrethrum, hoặc tham khảo ngữ cảnh sử dụng từ pyrethrum trong bộ từ điển Từ điển Tiếng Anh

1. At that time in Japan, pyrethrum powder was mixed with sawdust and burned to repel mosquitoes.

2. Active ingredients found in mosquito coils may include: Pyrethrum – a natural, powdered material from a kind of chrysanthemum plant.

3. Fossey is responsible for the revision of a European Community project that converted parkland into pyrethrum farms.

4. Heading No 1302 applies inter alia to liquorice extract and extract of pyrethrum, extract of hops, extract of aloes and opium.

5. Fewer than 10% of organic farmers use these pesticides regularly; one survey found that only 5.3% of vegetable growers in California use rotenone while 1.7% use pyrethrum.

6. The 19th century saw the introduction of two more natural pesticides, pyrethrum, which is derived from chrysanthemums, and rotenone, which is derived from the roots of tropical vegetables.

7. Treatment of ectoparasites includes manual procedures, such as repeated cleansing and combing out of lice-infected hair and also local antiparasitic treatment with permethrin, pyrethrum extract, allethrin and dimeticon.

8. Although pyrethrum (natural pyrethrins) is more effective against insects when used with piperonyl butoxide (which retards degradation of the pyrethrins), organic standards generally do not permit use of the latter substance.