insecticides

Confine the use of insecticides to the evening and do not spray plants that are in flower.

只在晚間使用殺蟲劑，而且不要對正在開花的植物噴藥。

柯林斯例句

In remote regions, the air is pure and the crops are free of poisonous insecticides.

在偏遠地區，空氣很純凈，莊稼也不施用有毒的殺蟲劑。

辭典例句

Farm workers frequently come in contact with these insecticides.

農場工人常常接觸這些殺蟲劑.

辭典例句

Resistance to insecticides has been apparent for many decades.

殺蟲劑抗藥性的出現已有數十年.

辭典例句

Insecticides are widely used for controlling most insect pests.

殺蟲劑廣泛應用于防治大多數害蟲.

辭典例句

Both Aldrin and Chlordane are valuable insecticides.

艾氏劑和氯丹都是重要的殺蟲劑.

辭典例句

Systemic insecticides have shown particular promise.

內吸殺蟲劑看來特別有效.

辭典例句

They are insects'worst enemies, killing far more pests than commercial insecticides do.

它們是昆蟲的死敵, 殺滅害蟲的能力要比作為商品的殺蟲劑大得多.

百科語句

The control of cucurbit wilt has been based on chemical insecticides applied for beetle control.

防治葫蘆科植物萎蔫病,至今仍依靠使用化學藥劑防治甲蟲.

辭典例句

I have decided to specialize in plant chemicals that can be used for insecticides.

我已經下決心專門研究可以用作殺蟲劑的植物中的化學物質.

辭典例句

Plants provide many chemicals that can be useful to humans, especially for drugs and insecticides.

植物能為人類提供有用的化學物質, 特別是藥物和殺蟲劑.

辭典例句

Spraying with insecticides and fungicides may be necessary to control any insects and diseases.

也許有必要噴灑殺蟲劑和殺菌劑以防止病蟲害.

辭典例句

It is not my contention that chemical insecticides must never be used.

我不是說人類決不能使用化學殺蟲劑.

互聯網

Methods: We measure the LD of flies on insecticides standard drop way.

方法: 采用點滴法測定家蠅對殺蟲劑的半數致死量.

互聯網

A group of insecticides called chlorinated hydrocarbons illustrate this effect.

一大批稱為氯化烴的殺蟲劑闡明了這種放大作用.

互聯網