Use parafilm to secure the tip of the buret.
要用石腊膜保护滴定管的塑胶头。
The basic buret is usually operated bY thumb and forefinger.
操作碱式滴定管是用拇指和食指。
So I suggest that operate the basic buret with thumb, forefinger and middle finger.
因此，我建议用拇指、食指和中指操作。
So I suggest that operate the basic buret with thumb, forefinger and middle finger.
因此，我建议用拇指、食指和中指操作。
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