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1·Little interval of water dropper should be chosen for sand, but large interval of water dropper can be chosen for loam soil.

对于砂土，应选择小的滴头间距，而对于壤土则可以选择大的滴头间距。

2·The study in this paper has the directive significance for choosing dripper discharge and interval of water dropper, as well as, designing irrigation quantity for line source drip irrigation.

该研究对线源滴灌滴头流量、滴头间距的选择以及灌水量的设计有指导意义。

3·Do not place the glass dropper directly into aquarium water unless you plan to thoroughly rinse it (inside and outside) with fresh water before placing dropper back into bottle;

不要将玻璃滴管直接接触鱼缸水﹐除非你打算事后以淡水彻底冲洗它（内部和外部）才放置滴管回到瓶内。