You can select certain layers and hit Control+Alt+B to set your work area to the duration of those layers, or if no layers are selected it will reset the work area to the entire comp.

你还可以选择某一层，按Ctrl+Alt+B设定工作区域和这个层一样，如果没有选中层，则工作区域被设定为整个合成的长度。

youdao

Conclusions the relatively high ALT level, low HBV DNA ration and early virus response are the major factors that affect the curative effect of lamivudine in treating chronic hepatitis B.

结论治疗前较高的ALT水平，较低的HBV DNA定量值及出现早期病毒学应答是影响拉米夫定治疗慢性乙型肝炎疗效的主要因素。

youdao

She will compete for the best album award - billed as the most prestigious - with Plan B, Alt-J, Paloma Faith and Mumford And Sons.

BBC: Brit Awards: Emeli Sande leads nominations

Rapper Plan B and Mercury Prize winners Alt-J are also cited in two categories.

BBC: Emeli Sande up for two Novello awards